iOS: ~60pt dead gray band above the header when presented as a page sheet (double top inset)

[mibrahimdev]

Symptom

On iOS, presentSharingan() shows ~60pt of empty gray between the sheet's top edge and the Sharingan header row. Present in 0.1.0 and 0.1.1 (see sharingan-ios-consumer-test/accept-central/ screenshots for both).

Analysis so far

• presentSharingan() presents SharinganViewController() with UIKit's default modal style → page sheet (SharinganViewController.kt:61).
• The shared Scaffold applies contentWindowInsets = WindowInsets.safeDrawing (SharinganScreen.kt:150).
• A page sheet already sits below the status bar (native sheet content is flush to its top), yet a full status-bar-sized top inset is still applied inside → the safe area is paid twice. The band is the Scaffold containerColor showing through the phantom innerPadding.
• Android unaffected (SharinganActivity is full-screen; safeDrawing is correct there).

Constraint for any fix

Swipe-down on the sheet is currently the ONLY dismissal affordance (no close button in the header). Switching to full-screen presentation would trap users — the fix must stay on the insets side or add an explicit dismissal affordance.

Open questions

• What does Compose Multiplatform actually report for safeDrawing inside a sheet-presented ComposeUIViewController — is this a known upstream bug?
• How to keep correct insets for hosts that embed SharinganViewController() full-screen (push/embed) while removing the phantom inset in the sheet case?

🤖 Generated with Claude Code

[mibrahimdev]

Upstream report draft (Compose Multiplatform)

Measured evidence for an upstream issue against JetBrains/compose-multiplatform (not yet filed — pending maintainer decision):

Title: iOS: WindowInsets (safeDrawing/statusBars/systemBars) report the UIWindow's safeAreaInsets, not the ComposeUIViewController view's — phantom top inset inside page sheets

Measurements (CMP 1.11, iPhone 16 Pro sim, iOS 18, values in pt):

Presentation	Compose safeDrawing.top	UIKit view.safeAreaInsets.top
Page sheet	62.0	0.0
Full screen	62.0	62.0
Embedded (host consumed insets)	62.0	0.0

In every mode Compose's statusBars.top == systemBars.top == safeDrawing.top == the window's top inset. UIKit's per-view safe area is already correct in all three modes, so sourcing insets from the VC's view would fix all cases. Nearest existing reports: CMP-7588, JetBrains/compose-multiplatform#4121, #4944, #5089.

Library-side mitigation shipped in PR #43 (entry-point-scoped top-inset strip for presentSharingan()); it degrades to a no-op if upstream fixes inset sourcing.

🤖 Generated with Claude Code