Changed

• gg v0.39.4 → v0.40.0 — alpha mask API (per-shape, per-layer, luminance, GPU interface)

Changed (Dependencies)

• gg v0.39.3 → v0.39.4, gogpu v0.26.3 → v0.26.4, wgpu v0.24.3 → v0.24.4
• Software backend: enterprise Present via GDI, core routing
• GOGPU_GRAPHICS_API=software renders at ~64 FPS on CPU

Fixed

• MSDF text overlapping on Retina — gg v0.39.1 → v0.39.3 fixes large text (28px+) overlapping letters on HiDPI displays (scale=2). (gg#247)

Changed (Dependencies)

• gg v0.39.0 → v0.39.1
• gogpu v0.26.1 → v0.26.3
• wgpu v0.23.9 → v0.24.2 (Metal texture flicker fix, SDF shapes fix, DX12 encoder pool, SetBindGroup slot fix)
• naga v0.16.6 → v0.17.0 (DXIL backend)

Changed (Dependencies)

• gg v0.38.3 → v0.39.0 (Path API: SoA layout, Iterate callback, GLES fixes)

Internal

• icon/svg.go: adapted to Path.Iterate() API (replaces Path.Elements())

Fixed

• Widget Gallery content invisible — isExpanded() duck-typing collision with collapsible.Widget.IsExpanded(). Replaced with private layoutExpander marker interface. (BUG-UI-GALLERY-001)
• Gallery theme switching — dropdown works after theme switch.

Changed (Dependencies)

• gg v0.38.2 → v0.38.3
• gogpu v0.26.0 → v0.26.1
• wgpu (indirect) v0.23.0 → v0.23.9
• naga (indirect) v0.15.0 → v0.16.6
• gputypes (indirect) v0.3.0 → v0.4.0

Changed (Dependencies)

• gg v0.38.1 → v0.38.2 (GLES clip/scissor fixes)
• gogpu v0.25.0 → v0.26.0
• wgpu (indirect) v0.22.1 → v0.23.0
• naga (indirect) v0.14.8 → v0.15.0

Changed (Dependencies)

• gg v0.38.0 → v0.38.1 (SVG renderer fixes, first-frame rendering improvements)

Summary

• DevTools design system — Complete JetBrains-inspired theme with 22 component painters (dark/light), theme/devtools/ package
• IDE layout example (examples/ide/) — GoLand-inspired: frameless titlebar, toolbar, project tree, editor/terminal tabs, sidebar strips, status bar
• Stripe toolbar widget (core/stripe/) — Vertical tool window sidebar with top/bottom groups, hover/active states, JB-accurate sizing
• SVG icon system — Full SVG rendering via gg/svg, 17 JetBrains expui icons (toolbar + sidebar), SVGRenderer Canvas interface
• TitleBar widget (core/titlebar/) — Frameless window title bar with leading/center zones, hit-test delegation
• Bug fixes — TabView local coordinates, focus redraw, toolbar NewRect width, titlebar hover tracking
• Dependencies — gg v0.38.0 (SVG renderer), gogpu v0.24.5, gpucontext v0.11.0, wgpu v0.22.1

Test plan

• go test ./... -count=1 — all pass
• golangci-lint run --timeout=5m — 0 issues
• go build ./... — clean build
• go run ./examples/ide/ — visual verification
• First-frame rendering tests (10 tests in app/first_frame_test.go)
• CI: Ubuntu, macOS, Windows

Fixed

• Animation scheduling — Fixed critical bug where animations only worked when the user moved the mouse. Root cause: needsLayout flag clobbered after layout, breaking re-invalidation from tickAnimation(). Affects all animated widgets (collapsible, slider, dialog, tabview, scrollview).

Added

• Animation frame pumper (~60fps) for smooth animations in event-driven mode
• BeginFrame() timing with DeltaTime clamping [0, 100ms]
• Collapsible DeltaTime clamping [1ms, 32ms]
• 13 regression tests

Full Changelog: v0.1.2...v0.1.3