fix(sorting): order display sets by the creation date/time of their instance, and show it

[wayfarer3130]

Context

Derived series are listed after the images in reverse date/time order, so the most recent
report or segmentation is the one nearest the images. In a study holding several SEGs and
SRs saved over a session, they did not interleave: all the SEGs clustered above all the SRs
regardless of when each was created, and the SEGs' order among themselves was arbitrary.

Three separate causes.

1. There was no single answer to "when was this display set created". compareSeriesDateTime
joined SeriesDate and SeriesTime into one string, so every SEG compared as
"20260817 undefined" — and "u" sorts above any digit, making a SEG look newer than
every dated series of the same day. Two SEGs from the same day tied outright and fell
through to reverse SeriesInstanceUID.

Each handler had its own fallback chain instead, and they disagreed: SR passed
SeriesDate/SeriesTime straight through; RTSTRUCT preferred StructureSetDate and
StructureSetTime, resolved independently, so a structure set with a SeriesDate but
no SeriesTime took its time from the structure set — possibly a different day, giving a
timestamp that never existed; SEG, PMAP, video, PDF and chart passed no time at all.

None of them used the instance date/time, which is the only date/time that moves when an
object is saved into an existing series: every instance of a series carries that series'
SeriesDate/SeriesTime, so a second report saved into an existing SR series still reports
the date the series was first created.

2. The same-series compare never decided anything. compareSameSeriesDisplaySet
returned the registered comparison only when it was zero:

if (!compareValue) {
  return compareValue;
}

so a real answer was discarded and sortByInstanceNumber decided instead. That makes
addSameSeriesCompare inert for ordering, and the sortVector that
notes-requirements.md documents as "display sets which match on series instance uid are
then compared using the sort vector" has no effect either.

sortByInstanceNumber has the same shape of bug in its guard clause:

return (!a && !b && 0) || (!a && -1) || 1;

Its own 0 is falsy, so two missing instances fall through it to -1 — meaning a pair of
display sets that both lack an instance compares as -1 in both directions. An
inconsistent comparator makes Array.prototype.sort produce an order that depends on the
starting order.

The existing sortStudy.test.js passed only because of that: with every comparison
answering -1, sort reverses the input, and the fixture happened to be supplied in
reverse. Feeding the same five display sets in a different starting order returned
ds4, ds3, ds2, ds1, ds5.

3. Newly saved objects were not identifiable as the most recent of their series. The
adapters derive a stored report's instance number as 1 + that of the one predecessor
instance it was given. The most recently created instance of a series is not necessarily
the one with the highest instance number, so that can collide with an instance that already
exists — and then the handlers' "last instance is the newest one" no longer holds. Nothing
set an instance level date/time on the way out either, so there was nothing to fall back to.

Changes & Results

One rule for the date/time — platform/core/src/utils/seriesDateTime.ts.
getSeriesDateTime chooses a single date/time from every attribute an instance carries:
InstanceCreationDate/Time, ContentDate/Time, AcquisitionDate/Time (or the
combined AcquisitionDateTime), StructureSetDate/Time,
PresentationCreationDate/Time and SeriesDate/Time.

• The date is the latest date found in any of them.
• The time is the latest time found in an attribute carrying that exact same date, so a
  time is never combined with a date it did not arrive with and the result is always a
  date/time that really occurred.
• With no time for the winning date the time is empty, and the ordering is accurate to the
  day — as good as the data allows.
• StudyDate/StudyTime are excluded: every series in the study shares them, so they
  cannot tell one series from another.
• A value that is not a DICOM DA counts as no date at all. Some series level metadata carries
  a date already formatted for display, and 19-Jan-2026 would otherwise read as 192026 —
  ordering by day of month, and making two different months compare as equal.

Sorting — platform/core/utils/sortStudy.

• Instances sort by increasing instance number, as before. Only when the instance numbers
  do not decide — they tie, or neither has one — does the sort fall back to the creation
  date/time, and then to the sop instance uid. The last instance of a series is taken to be
  the most recently created one, so an instance number that fails to say which that is has
  to be replaced by something that does.
• Two frames of one instance are excluded from that fallback: they share the single date/time
  their instance has, so only the frame number orders them. They are recognised by their
  shared sop instance uid, which is also what keeps a large multi frame series cheap to sort —
  its frames all carry the same instance number, so every pair reaches the fallback.
• Display sets are ordered by the creation date/time of the instance they show, which they
  carry as instance.
• Series, and display sets whose instance says nothing about when it was created, have
  nothing but their own SeriesDate/SeriesTime and are ordered by those alone — so
  sorting a list of series rather than display sets stays the plain series date/time sort it
  always was.
• The registered same-series comparison is returned when it is non-zero, and two missing
  instances are treated as equal.
• processSeriesResults in the DICOMweb data source sorts on the raw SeriesDate and
  formats it for display afterwards. It was sorting series rows whose date had already been
  formatted, which no date rule can order.

Handlers — cornerstone-dicom-seg, cornerstone-dicom-rt, cornerstone-dicom-sr,
cornerstone-dicom-pmap, dicom-video, dicom-pdf and the chart SOP class handler in
extensions/default take their display set's SeriesDate/SeriesTime from
getSeriesDateTime on the instance they chose, replacing seven different fallback chains.
The RTSTRUCT handler's existing comment already asked for this — "the display set date …
should be the date of the instance being used" — and the date shown in the study panel is
now the same one the sort uses.

Saving — platform/core/utils/updateNewInstanceMetadata, called from storeMeasurements
and storeSegmentation. Every report, segmentation and structure set OHIF stores is stamped
with the current InstanceCreationDate/Time and ContentDate/Time, and with an
instance number one higher than every instance already in its series, read from
DicomMetadataStore. The adapters apply their predecessor metadata after the caller's
options, so the instance level stamp has to be corrected on the way out rather than passed in.

Both are read as wall clock values in the object's own timezone —
TimezoneOffsetFromUTC when it declares one, the local zone otherwise — since DICOM DA and
TM are displayed exactly as they are stored.

The series level date/time is passed in at generation time instead. It cannot be stamped
alongside the instance one: an object added to an existing series has to keep that series'
own date/time, and updateNewInstanceMetadata cannot tell the two cases apart. So the store
commands hand the generation the values it should use, from getCurrentDicomDateTime and in
the same zone: SeriesDate/SeriesTime when a new series is being created, and
StructureSetDate/StructureSetTime for every structure set, since that pair is the
creation stamp of the structure set itself whichever series it goes into. ContentDate/Time
go with them for a SEG, whose download path does not reach the stamp at all.

Both dcmjs (DerivedDataset) and the adapters (createInstance) honour these as options and
otherwise default them to UTC — which west of UTC is a day ahead around midnight, and then
wins the latest date getSeriesDateTime reads. That defeated the instance stamp for every
new series: a report saved at 20:00 on 19 Aug in New York got SeriesDate 20 Aug from dcmjs
against its own ContentDate of 19 Aug, and read as a day ahead in both the sort and the
thumbnail.

generalImageModule in platform/core/classes/MetadataProvider now carries
sopClassUID, instanceCreationDate/Time and contentDate/Time.
@cornerstonejs/metadata lists these among the module's attributes, and derived instance
creation and the predecessor reference both read them, but OHIF supplied none of them.

Showing the date/time the order comes from — studyBrowser.thumbnailDetails. With the
sort fixed, the study browser still gave no way to tell that it was right: the thumbnail
detail line shows the series number and the instance count only, so several reports or
segmentations saved on the same day read as identical and their order looks arbitrary — the
same complaint the sort itself started from. The date/time being sorted on has to be visible
for the ordering to be checkable at all, which is what this customization is for.

It declares what goes on that line the same way the viewport overlay items declare theirs: a
list of items, each with an id, an optional condition deciding whether to include it, and
a value taken from its own contentF, from a named source, or from an attribute of the
instance the display set shows. label prefixes the value, title is its tooltip, and
iconName puts an icon before it. An item with no value is left out.

condition and iconName may each be a function or a name — resolved against
studyBrowser.thumbnailDetailTests and studyBrowser.thumbnailDetailSources — so the whole
line can be declared as data, which is what a ?customization= file is limited to: those are
fetched and parsed as JSONC and never executed, so a function-only design could not be driven
from the URL at all.

The default is the series number and the instance count, exactly as the thumbnails have
always shown, so nothing changes until someone overrides it. That default lives in the
thumbnail itself, so it is reachable only while nothing is resolved for it: with no items to
resolve resolveThumbnailDetails answers with nothing at all rather than with no items,
whereas an empty list is a customization asking for an empty line and is honoured as one.
Named sources ship as
seriesNumber, numInstances, seriesDate and instanceDateTime; the one named test is
isDerivedDisplaySet.

platform/app/public/customizations/studyBrowser/derivedDateTime.jsonc is the example,
written to match the veterinary demographics overlay — a global payload, $push so the
default items are kept rather than replaced, and names rather than functions:

{ "id": "InstanceDateTime", "source": "instanceDateTime",
  "condition": "isDerivedDisplaySet", "title": "Created" }

instanceDateTime reads getSeriesDateTime off the display set's instance — the same value
the sort uses — and formats it to DD-MMM-YYYY HH:mm. No seconds and nothing below them: the
second a report was written says nothing a reader can use, and is not reliably recorded
either.

The panel resolves the items and hands the thumbnail plain data, so resolveThumbnailDetails
is a pure function and ui-next stays presentational — only one file there imports
@ohif/core today, with a note about why that is fragile. Resolution sits in a wrapper around
the display set mapper in PanelStudyBrowser, which covers all three of its call sites and
the measurement tracking panel's own mapper.

	study browser thumbnail
default	SEG Segmentation / S:42 ⧉ 1
?customization=studyBrowser/derivedDateTime	SEG Segmentation / S:42 ⧉ 1 13-Sep-2022 16:35

Before / after for a study with an MR series, SRs at 09:00 and 14:00, and SEGs at 09:30 and
13:30:

before   MR | SEG 13:30 | SEG 09:30 | SR 14:00 | SR 09:00
after    MR | SR 14:00  | SEG 13:30 | SEG 09:30 | SR 09:00

Note the same-series fix changes ordering for anyone who registers an addSameSeriesCompare
function — that registration now takes effect, where before it was ignored.

Testing

jest at the root — 105 suites / 1268 tests pass. tests/ThumbnailDetails.spec.ts passed
against the e2e server when it was added; the changes since then are to the sort rules and to
the metadata generated on save, neither of which it exercises.

• platform/core/src/utils/seriesDateTime.test.js covers the date/time choice: the latest
  date, the latest time of the winning date, a time borrowed from another attribute of the
  same date, never taking a time from a different date, an ignored study date, a date that is
  not a DICOM DA (and the dotted retired form, which is one), the combined
  AcquisitionDateTime, the lower camel case spelling of series metadata, and the sort key's
  padding and ordering.
• platform/core/src/utils/sortStudy.test.js covers display sets ordered by their
  instance's creation date/time, series with no instance ordered by the series date/time, the
  fallback when the instance has no date, compare symmetry, the instance number taking
  precedence over the creation date/time and the fallback when it ties, the frames of one
  instance ordering by frame number, sources with no sop instance uid keeping the order they
  came in, and derived series interleaving. Reverting sortStudy.ts alone fails its cases.
• platform/core/src/utils/updateNewInstanceMetadata.test.js covers the next instance number
  over a series whose highest number is not the last one, the first instance of a new series,
  and the stamped date/time being what getSeriesDateTime then reports.
• extensions/default/src/SOPClassHandlers/chartSOPClassHandler.test.ts asserts the date and
  time reach the display set, including the instance date winning over an older series date.
• extensions/default/src/Panels/StudyBrowser/resolveThumbnailDetails.test.ts covers the
  detail items: the default coming to the series number and the instance count, each of the
  three ways an item gets its value, a named and a function condition, an item named after a
  test that is not registered, no items resolving to nothing at all while an empty list
  resolves to an empty line, and the instanceDateTime source reporting the instance's
  creation date/time to the minute rather than the series one.
• platform/ui-next/src/components/Thumbnail/Thumbnail.test.ts renders both view presets and
  asserts the detail line still reads S:<series number> and the instance count when no
  details are supplied, and the supplied items in order when they are.
• tests/ThumbnailDetails.spec.ts opens a study with a SEG and checks the default item ids,
  then loads ?customization=studyBrowser/derivedDateTime and checks that the date/time is
  appended and formatted to the minute.

Two small things were needed for the component test: platform/ui-next/src/__mocks__/ fileMock.js, since the shared jest config maps every static asset there and this package had
no copy, so any test reaching the Icons barrel failed to resolve; and the test is a .test.ts
using createElement, because the jest projects' testMatch does not include .tsx. Happy
to widen testMatch instead if that is preferred.

For the display set changes: open a study that has both a SEG and an SR saved at different
times of the same day (saving one of each from the viewer is enough) and check the study
panel — the derived series read newest-first as a single group rather than SEGs first. Then
save a second report into an existing series and confirm it moves to the front of the group.
Adding &customization=studyBrowser/derivedDateTime shows the date/time each of them is
ordered by.
Of the handlers touched, only the chart one lives in a package with a jest project, so it is
the one with a direct handler test; cornerstone-dicom-seg, cornerstone-dicom-rt,
cornerstone-dicom-sr, cornerstone-dicom-pmap, dicom-video and dicom-pdf have none
upstream, and the change in each is now the same two lines. Happy to add the project configs
if wanted. The same goes for the two store commands: the date/time they pass to the object
generation has no unit test, and is verified by reading the paths it flows through —
DerivedDataset.assignFromOptions covers SeriesDate/SeriesTime/ContentDate/ContentTime,
createInstance assigns StructureSetDate/Time because RTSS_INSTANCE_DATA already
carries those keys, nothing in DerivedPixels, StructuredReport or the SEG adapter copies a
date from the reference dataset, and the predecessor Object.assign that restores an existing
series' own date/time runs afterwards and carries no structure set stamp.

Checklist

PR

• My Pull Request title is descriptive, accurate and follows the semantic-release
  format and guidelines.

Code

• My code has been well-documented (function documentation, inline comments, etc.)

Public Documentation Updates

• The documentation page has been updated as necessary for any public API additions or
  removals. (notes-requirements.md gains a "Display Set Date and Time" section stating the
  instance, display set and series sort rules; sampleCustomizations.tsx gains entries for
  studyBrowser.thumbnailDetails, studyBrowser.thumbnailDetailSources and
  studyBrowser.thumbnailDetailTests.)

Tested Environment

• OS: Windows 11
• Node version: 24.2.0
• Browser: Chromium, via the e2e server for the study browser change; the sort changes are
  covered by unit tests (jsdom) and change no rendering

Summary by CodeRabbit

• New Features

  • Study Browser thumbnails now support customizable detail lines, including series number, instance count, and derived-series date/time.
  • Newly saved segmentations and measurements receive current date/time and sequential instance metadata.

• Bug Fixes

  • Improved ordering of series and instances using reliable date/time and instance-number comparisons.
  • Display-set dates and times now consistently reflect the most relevant available DICOM attributes.

• Documentation

  • Added guidance for configuring thumbnail details and derived-series date/time display.

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📝 Walkthrough

Walkthrough

Shared utilities now resolve DICOM date-time values for display sets and study sorting. Derived reports and segmentations receive current date-time values and sequential instance numbers. Study-browser thumbnails now support configurable detail lines.

Changes

Series date-time and thumbnail details

Layer / File(s)	Summary
Shared date-time resolution platform/core/src/utils/seriesDateTime.ts, platform/core/src/utils/index.ts, platform/core/src/utils/seriesDateTime.test.js	Utilities select the latest valid date and matching time from supported DICOM attributes.
Study sorting comparators platform/core/src/utils/sortStudy.ts, platform/core/src/utils/sortStudy.test.js	Sorting handles registered comparators, missing instances, instance-number ties, creation date-time, series date-time, and deterministic fallbacks.
Generated instance metadata platform/core/src/utils/updateNewInstanceMetadata.ts, platform/core/src/utils/updateNewInstanceMetadata.test.js, platform/core/src/classes/MetadataProvider.ts, extensions/cornerstone-dicom-seg/src/commandsModule.ts, extensions/cornerstone-dicom-sr/src/commandsModule.ts	Generated datasets receive current DICOM date-time values and instance numbers above prior series instances.
Display-set date-time integration extensions/cornerstone-dicom-*/src/getSopClassHandlerModule.*, extensions/default/src/SOPClassHandlers/chartSOPClassHandler.*, extensions/dicom-pdf/src/getSopClassHandlerModule.js, extensions/dicom-video/src/getSopClassHandlerModule.js	Display-set handlers use utils.getSeriesDateTime(instance) and pass the resolved values through.
Thumbnail detail resolution and customization extensions/default/src/Panels/StudyBrowser/*, extensions/default/src/customizations/thumbnailDetailsCustomization.ts, extensions/default/src/getCustomizationModule.tsx, platform/app/public/customizations/studyBrowser/derivedDateTime.jsonc, platform/docs/docs/platform/services/customization-service/sampleCustomizations.tsx, tests/ThumbnailDetails.spec.ts	Study-browser details resolve from configured sources, attributes, functions, and conditions. The default configuration shows series number and instance count, with an optional derived-series date-time item.
Thumbnail rendering contract platform/ui-next/src/components/Thumbnail/*, platform/ui-next/src/components/ThumbnailList/ThumbnailList.tsx, platform/ui-next/src/components/StudyBrowser/StudyBrowser.tsx, platform/ui-next/src/__mocks__/fileMock.js	Thumbnail and list views render supplied detail items and retain default details when the prop is absent. PropTypes and test asset handling are updated.

Estimated code review effort: 4 (Complex) | ~45 minutes

Merge Risk: 🟡 Moderate · up to 7e412

The change improves chronological ordering and derived-series metadata, but offset-bearing DICOM timestamps may still be ordered incorrectly and display sets may retain an outdated timestamp after their selected instance changes. These can affect study-browser ordering, so resolution is needed before merge.

Sequence Diagram(s)

sequenceDiagram
  participant StudyBrowser
  participant CustomizationService
  participant resolveThumbnailDetails
  participant Thumbnail
  StudyBrowser->>CustomizationService: read detail configuration
  StudyBrowser->>resolveThumbnailDetails: resolve display-set details
  resolveThumbnailDetails->>CustomizationService: evaluate sources and conditions
  resolveThumbnailDetails-->>StudyBrowser: return ordered details
  StudyBrowser->>Thumbnail: pass detail items
  Thumbnail-->>StudyBrowser: render thumbnail details

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Title check	✅ Passed	The title clearly summarizes the primary changes: ordering display sets by instance creation date/time and displaying that information.

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Actionable comments posted: 1

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Inline comments:
In `@extensions/cornerstone-dicom-seg/src/getSopClassHandlerModule.ts`:
- Around line 271-276: Update the SEG timestamp selection in
getSopClassHandlerModule so SeriesDate and SeriesTime are used together only
when both exist; otherwise fall back to the complete StructureSetDate and
StructureSetTime pair, avoiding mixed-source timestamps. Add coverage for
differing series and structure-set dates and verify sortStudy orders the
resulting display sets correctly.

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• platform/core/src/utils/sortStudy.ts

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[wayfarer3130]

@jbocce - this is just some series sorting issues for saving SEGs multiple times on the same day (or RTSTRUCT) - they ended up randomly ordered.

[jbocce]

Please check the code rabbit comment I flagged. Thanks.

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⚠️ Outside diff range comments (1)

platform/core/src/utils/sortStudy.ts (1)

141-141: 🎯 Functional Correctness | 🟠 Major | ⚡ Quick win

Place a missing instance after an existing instance.

When a is missing and b exists, Line 141 returns -1. Array.sort then places the missing instance first. This reverses the documented ordering and makes instance-less display sets precede display sets with an instance. Swap the return signs.

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only still-valid issues, skip the rest with a brief reason, keep changes
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In `@platform/core/src/utils/sortStudy.ts` at line 141, Update the comparator
around the return a ? 1 : -1 branch so that when a is missing and b exists, the
missing instance sorts after the existing instance; swap the return signs while
preserving the ordering for other cases.

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Inline comments:
In `@extensions/cornerstone-dicom-sr/src/getSopClassHandlerModule.ts`:
- Line 115: Refresh SeriesDate and SeriesTime after addInstances replaces
this.instance in both
extensions/cornerstone-dicom-sr/src/getSopClassHandlerModule.ts:115-115 and
extensions/default/src/SOPClassHandlers/chartSOPClassHandler.ts:28-28, using
each handler’s existing timestamp utility. Add regression tests covering
addInstances with a newer instance-level timestamp and verify the display-set
metadata updates.

In `@platform/core/src/utils/seriesDateTime.ts`:
- Line 74: Update the date-time key generation around the combined DICOM value
formatting to parse and apply any UTC offset together with the date before
producing sortable keys, preserving existing behavior for values without
offsets. Add a regression test covering equivalent offset-bearing values whose
chronological order differs from their local clock order.

---

Outside diff comments:
In `@platform/core/src/utils/sortStudy.ts`:
- Line 141: Update the comparator around the return a ? 1 : -1 branch so that
when a is missing and b exists, the missing instance sorts after the existing
instance; swap the return signs while preserving the ordering for other cases.

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• extensions/cornerstone-dicom-pmap/src/getSopClassHandlerModule.ts
• extensions/cornerstone-dicom-rt/src/getSopClassHandlerModule.ts
• extensions/cornerstone-dicom-seg/src/commandsModule.ts
• extensions/cornerstone-dicom-seg/src/getSopClassHandlerModule.ts
• extensions/cornerstone-dicom-sr/src/commandsModule.ts
• extensions/cornerstone-dicom-sr/src/getSopClassHandlerModule.ts
• extensions/default/src/SOPClassHandlers/chartSOPClassHandler.test.ts
• extensions/default/src/SOPClassHandlers/chartSOPClassHandler.ts
• extensions/dicom-pdf/src/getSopClassHandlerModule.js
• extensions/dicom-video/src/getSopClassHandlerModule.js
• platform/core/src/classes/MetadataProvider.ts
• platform/core/src/utils/index.ts
• platform/core/src/utils/seriesDateTime.test.js
• platform/core/src/utils/seriesDateTime.ts
• platform/core/src/utils/sortStudy.test.js
• platform/core/src/utils/sortStudy.ts
• platform/core/src/utils/updateNewInstanceMetadata.test.js
• platform/core/src/utils/updateNewInstanceMetadata.ts
• platform/docs/docs/development/notes-requirements.md

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[wayfarer3130]

@dan-rukas one for you to weigh in on: should the date/time be on by default?

Context — with the sort fixed, the study browser gave no way to see that it was fixed. The
thumbnail detail line shows the series number and the instance count only, so several reports
or segmentations saved on the same day read as identical and their order still looks
arbitrary, which is the complaint this PR started from. So the last commit makes that line
customizable (studyBrowser.thumbnailDetails, declared like the viewport overlay items) and
ships an example that appends the creation date/time the sort actually uses:

	study browser thumbnail
default	SEG Segmentation / S:42 ⧉ 1
?customization=studyBrowser/derivedDateTime	SEG Segmentation / S:42 ⧉ 1 13-Sep-2022 16:35

I kept the default as it is today so this PR changes nothing visually, but I think there is a
good case for the date/time version being the default, at least for derived series:

• it is the field the list is ordered by, and an order whose key is invisible is one nobody
  can trust or report a bug against;
• it is the one thing that distinguishes two reports on the same series — the series number
  and description are identical for both;
• it costs one line of already-loaded metadata, and the detail line has room for it in both
  view presets.

Against: it is a visible change to every deployment's study browser, and for plain image
series it mostly repeats the series date already shown elsewhere — which is why the example
restricts it to derived series via condition: 'isDerivedDisplaySet'.

Flipping it is a one-line change to the default items in
extensions/default/src/customizations/thumbnailDetailsCustomization.ts — the same item the
example JSONC pushes. Happy to do it in this PR or leave it for a follow-up; your call on
whether it wants a design review first.

[wayfarer3130]

@jbocce - I updated the PR, it was indeed getting the wrong behaviour and that actually brought up a couple of other issues so I added a customization to allow displaying the sorting information in the view so it is obvious what is happening. We can decide later to include that as a default, or can leave it as is.

Applied requested changes

[jbocce]

3. An empty details array blanks the line. details ?? [default] falls back only on null/undefined, so details: [] renders nothing instead of the series number and count. The shipped defaults never produce an empty array, but a customization that filters everything out would silently blank the line. Suggest details?.length ? details : [default].

[wayfarer3130]

I actually don't see that as a problem - if someone configures it that way, maybe there is a good reason to.

[wayfarer3130]

I made this change and then backed it out — the ?? is deliberate, and there is a test pinning it: Thumbnail.test.ts → leaves the detail line empty when there are no details.

The two states mean different things:

• details unset → no customization was resolved for this thumbnail, so the defaults stand in. PanelStudyBrowser relies on this: when it cannot find the display set it leaves details unset precisely so the series number and count still show.
• details empty → a customization ran and resolved to no items, and that empty line is honoured.

Switching to details?.length ? … collapses the two and removes any way for a customization to say "no detail line for this one" — the thumbnailDetailTests filtering you are describing is the mechanism for exactly that. So a customization that filters everything out blanking the line is the intended outcome, not a silent failure.

I have left the code as it was and added a comment spelling out the ?? vs || distinction so the next reader does not have to infer it. If you would still rather the defaults always win, say so and I will flip it and update the test.

[wayfarer3130]

Merged origin/master (through beta.21, including #6221).

One conflict, in extensions/cornerstone-dicom-seg/src/commandsModule.ts: #6221 added the predecessor series Object.assign at the same point this branch added the updateNewInstanceMetadata stamp. Both are kept, and the order between them matters — the assign runs first:

if (series) {
  Object.assign(naturalizedReport, metaData.get(csEnums.MetadataModules.PREDECESSOR_SEQUENCE, series));
}
utils.updateNewInstanceMetadata(naturalizedReport);

updateNewInstanceMetadata looks the series up in DicomMetadataStore by dataset.SeriesInstanceUID to find the instances already in it. Until the assign has run, that UID is still the one dcmjs invented for a brand new series, so the lookup would find no prior instances and number the new instance 1 — colliding with what is already in the series being extended. Stamping second also means the creation date/time win over anything the predecessor data carries, which is what we want for a newly authored object.

Worth a look from whoever knows #6221 best, since it is the kind of dependency that survives a merge silently.

Also moved the display set ordering behaviour changes out of notes-requirements.md and into the 3p13-to-3p14 guide that #6221 introduced — see the reply on the addSameSeriesCompare thread.