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.claude/skills/screenshots/SKILL.md

@@ -37,6 +37,21 @@ term`, which says nothing about the cause. Check with `pgrep -f shots.rb`
 before starting one; a backgrounded rig reported as finished is not proof, and
 two of them overlapping is what filed a set of empty Vision Pro rooms.
 
+**A second Xcode can swap the simulators out from under the one you build
+with.** `xcode-select` picks the `xcodebuild` and `simctl`, but the machinery
+that runs every simulator — `com.apple.pkg.XcodeSystemResources`, with
+CoreSimulatorService in it — is system-wide, and it is whichever Xcode last
+installed its components. With the 27.1 beta installed beside 27.0, it was
+27.1. The iOS 27.0 simulators' `backboardd` then aborted in Metal
+(`MTLSimDevice newTextureWithDescriptor`) after a few launches and
+rotations. The run died as `Test crashed with signal kill`, twice in a row,
+in a different shot each time, with the app's own code blameless. The old
+code crashed the same way. Check `pkgutil --pkg-info
+com.apple.pkg.XcodeSystemResources` before a shoot. If it is not the release
+you build with, reinstall that release's package
+(`sudo installer -pkg <Xcode>/Contents/Resources/Packages/XcodeSystemResources.pkg -target /`),
+then `simctl shutdown all` and restart CoreSimulatorService.
+
 **A stuck app survives `kill -9`.** A run killed mid-flight can leave the app
 being traced by an orphaned `debugserver`, `ps` showing `SX`; every later Mac
 run then fails with `Failed to terminate space.hiraku.tortoiseblocks:<pid>`,

App/Views/CLAUDE.md

@@ -144,10 +144,15 @@ worse. Taking either `ToolbarSpacer` away changed nothing. `CanvasViewToggle`
 therefore offers the words and then the icons, through `ViewThatFits`, each
 form `fixedSize` so it can never be squeezed into an ellipsis. What that gives,
 measured: the words on the 13-inch landscape (both languages), on the Mac (in
-Japanese) and the phone's sheet (in English), and English on the 11-inch
-landscape; the icons in portrait on
-both iPads and for Japanese on the 11-inch landscape. Judge a change here on
-the 11-inch, in portrait and in Japanese: that is the narrowest case.
+Japanese) and in the phone's sheet (in English). The icons in portrait on both
+iPads, and for Japanese on the 11-inch landscape. English on the 11-inch
+landscape sits on the boundary. A freshly opened document with blocks in it
+showed the words throughout. An empty one showed them until its first block,
+then switched to the icons and stayed there — presumably the toolbar offers a
+hair less once its buttons change state, though that was not pinned down.
+That one-time flip was looked at and accepted
+rather than engineered away. Judge a change here on the 11-inch, in portrait
+and in Japanese (the narrowest cases), and from an empty document.
 
 **26's glass is not used on any surface of ours, and that was tested rather
 than assumed** (#79). All three candidates were built and looked at, and all

App/Views/ContentView.swift

@@ -465,11 +465,14 @@ struct CanvasToolbar: ToolbarContent {
 /// fixed one after it was what ran out: taking each away changed nothing.
 ///
 /// So the words are offered first and the icons second, and `ViewThatFits`
-/// takes whichever the toolbar has room for. The toolbar is a little stingier
-/// than `fixedSize` would suggest: the 11-inch's landscape column fits the
-/// English words but not 「キャンバス」, so Japanese gets the icons there. The
-/// 13-inch landscape keeps the words in both languages. VoiceOver reads
-/// "Canvas" and "Code" either way.
+/// takes whichever the toolbar has room for. The 13-inch landscape keeps the
+/// words in both languages. The 11-inch landscape column is the boundary: it
+/// never fits 「キャンバス」, and it fits the English words only until the
+/// toolbar's own state changes. An empty document shows "Canvas | Code", and
+/// the first block — which is when ⟳ comes on — turns them into the icons for
+/// good. That flip was seen and accepted: it happens once, and nothing is cut
+/// or hidden either side of it. VoiceOver reads "Canvas" and "Code" either
+/// way.
 struct CanvasViewToggle: View {
     @Binding var showsCode: Bool
 

Tools/film/previews.rb

@@ -151,7 +151,10 @@ def record_vision(profile, raw)
 
   FileUtils.rm_rf(raw)
   FileUtils.mkdir_p(raw)
-  3.times do |attempt|
+  # Five tries, where the screenshot rig makes three: the sheet failing to
+  # come up is the same flake there, but here it once failed three launches
+  # running, and the run after that needed three.
+  5.times do |attempt|
     # Reinstalled every time: visionOS restores an app's windows, and a launch
     # that inherits the last one's opens a second set on top.
     Film.simctl("terminate", udid, Film::BUNDLE_ID)
@@ -187,7 +190,7 @@ def record_vision(profile, raw)
 
     warn("  an empty room on attempt #{attempt + 1} (ink #{measured.round(4)}), relaunching")
   end
-  abort("vision never came up with a sheet after three attempts")
+  abort("vision never came up with a sheet after five attempts")
 end
 
 def compose_vision(profile, raw)