[Tryanks]

Summary

gpui-base, gpui-kit and gpui-webview go to 0.8.1. That moves gpui-fast from 0.1.10 to 0.1.12 and gpui-pre to 0.3.10. Tcode follows the API changes, removes the workarounds upstream has now fixed, and adopts upstream's new multi-click selection rule.

 Dependencies
-  gpui-base / gpui-kit / gpui-webview 0.8.0, gpui-fast 0.1.10, gpui-pre(-reqwest-client) 0.3.9
+  gpui-base / gpui-kit / gpui-webview 0.8.1, gpui-fast(-*) 0.1.12, gpui-pre(-reqwest-client) 0.3.10

 API migration (behaviour unchanged)
-  ScrollWheelEvent / PlatformInput::ScrollWheel / on_scroll_wheel
+  ScrollEvent / PlatformInput::Scroll / on_scroll; touch pans (two-finger and in tests) are ScrollSource::Touch
-  KeyBinding::new("secondary-…")        # compiles, but panics at startup on gpui-fast 0.1.12
+  shortcut::secondary("secondary-…", …, cx)   # KeyBinding::load, OS resolved at run time
-  Kbd::format(key)                       # cfg!(target_os = "macos")
+  Kbd::format(key, cx.platform_info().os)
+  gpui-ios / gpui-android: Platform::platform_info (Ios / Android, Native); WindowInsets::corner_radii = 0

 Workarounds removed (upstream fixed)
-  page_viewport: ScrollBounce.scroll_wheel(false)        # #933; gpui-kit#3631 #3632
-  sidebar provider_mark: empty slot while marks are off  # gpui-fast#68 (fixed in 0.1.9)
-  chat timeline row: .id(("timeline-row", identity))    # gpui-fast#68

 Adopted (gpui-kit#3681)
+  transcript selection: a drag after a double/triple click, and a shift-click after it, extend by word/line

Transcript selection (markdown/selection.rs):

 mouse down, click_count > 1
   select_unit(word | line)
+  hold_unit()                       # held until release
 drag(point)
-  set(anchor, point)
+  if unit held: before the unit → (unit.end, start of the word/line at point)
+                after the unit  → (unit.start, end of the word/line at point)
+                inside          → the unit itself
 press(point, shift)
+  shift with a unit held → extend the same way; any plain press drops the unit

What changes for users

• Browser on a Mac: secondary shortcuts (⌘K palette, ⌘1–9, ⌘Z, image-viewer zoom) now bind Command, and the hints show ⌘. GPUI's Modifiers::secondary is now OS-aware (zed#65970). Editing keys inside inputs still use gpui-base's compile-time bindings (Ctrl). Native builds are unchanged, iOS included (secondary = Control, plus Tcode's own Cmd editing bindings).
• Page viewports (chat timeline, settings, sidebar, panels) use gpui-base's own wheel and trackpad edge bounce again.
• Changes that come with the upgrade:
  • Elastic edges no longer overscroll falsely from rounding or at large offsets.
  • A focused button that becomes disabled keeps Tab traversal.
  • Clicking blank space on a Toolbar no longer takes focus.
  • A focus trap's Tab search stops at the first repeated stop.
  • Resizable dividers read the drag state when each event arrives.
  • A focused input asks its scroll container to reveal it.
  • gpui-fast measures text that reaches prepaint unmeasured instead of panicking, and Windows draws frames on demand.

Checked and left as they are

• The iOS input workarounds: character_index_for_point, the mark left open on blur, the length query and the selection setter. Upstream code is unchanged.
• The iOS Cmd editing bindings.
• web/keyboard.rs and the input's mouse-up keyboard request on wasm.
• Transcript selection stays Tcode's own: gpui-base's window selection still reaches the whole window and ends only on a bubble-phase release.
• The on_prepaint origin change (gpui-kit#3689) doesn't affect Tcode: its sites read only the size, or sit on unpadded elements.
• Dialog::centered, the Sheet/notification insets, DataTable and Diff live in gpui-component, which Tcode doesn't use.

Not done

• ScrollSource::Touch could tell the edge-back and sidebar swipe gestures apart from trackpad scrolls. That needs checking on a device.
• The iOS host could report real corner_radii, which needs a Swift host change.

Evidence

Before: on gpui-fast 0.1.12, KeyBinding::new("secondary-k", …) fails to parse (Keystroke::parse no longer resolves secondary), so the bindings in shortcut::init and run_shell panic at startup. Clippy also fails on gpui-mobile-touch (PlatformInput::ScrollWheel no longer exists), and the iOS crate fails on the missing platform_info and corner_radii.

After:

cargo fmt --all --check                                         ok
cargo clippy --workspace --all-targets --locked -D warnings     ok
cargo nextest run --workspace --locked                          1358 passed, 13 skipped
cargo check -p tcode-ios --target aarch64-apple-ios-sim  (-D warnings)        ok
cargo check -p tcode-web --target wasm32-unknown-unknown (-D warnings)        ok
cargo check -p gpui-android --target aarch64-linux-android (-D warnings)      ok
cargo test -p gpui-ios --lib                                    7 passed
cargo machete                                                   no unused dependencies

New test: a_drag_or_shift_click_from_a_double_click_extends_by_words.

double-click "beta" → drag to "delta" → "beta gamma delta"   (before: still "beta")
                    → drag to "alpha" → "alpha beta"
                    → back into "beta" → "beta"
shift-click "gamma" after it          → "beta gamma"
plain click, then shift-click         → plain character range "pha beta ga"

It failed before the change (left: "beta", right: "beta gamma delta") and passes after.

Existing regression tests that cover the removed workarounds still pass without them:

• a_drag_right_after_a_flick_scrolls_the_timeline (Scroll the page under a drag that follows a flick #933)
• thread_rows_carry_the_provider_mark_until_the_setting_is_off (Add off-by-default provider marks to sidebar thread rows #452)
• collapsing_work_log_preserves_following_message_bounds (Fix assistant layout after collapsing a work log #898)

No test failed, was removed or was rewritten. Test event literals only gained source: Touch where the test simulates a finger, the default Pointer for wheel and trackpad.

Desktop app launched on a throwaway TCODE_DATA_DIR: it starts without a panic and the sidebar hint shows ⌘K. Synthetic keystrokes couldn't be delivered to the app in this environment, so a throwaway test (not committed) checked shortcut::secondary("secondary-k") on macOS instead: it binds cmd-k, ⌘K dispatches the action and Ctrl-K does not.

Not run locally:

• tcode-android (no NDK on this machine; gpui-android itself checks)
• the Linux headless --features web clippy (needs the browser bundle)
• Windows and Linux runners
• device checks for page bounce, and on iPad and in a browser on a Mac

Merge Danger

Door: two-way

A dependency bump plus local refactors. A revert restores 0.8.0 exactly; nothing persisted or on the wire changes.

Blast Radius: input-wide

Scroll bounce on every page viewport, every secondary shortcut and its hint (browser on a Mac only), and transcript multi-click selection. gpui-fast's list scroll-anchoring rewrite and Taffy 0.15 reach every list and layout; the chat suite passes, but long-transcript scrolling deserves a manual pass.