Bug: Windows overlap while resizing, until slower apps catch up

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@mattchristenson がすでに取り組んでいます。

2026年9月30日 から。

  • #570 @mattchristenson による — オープン

評価

難易度
4/5
見積もり時間
3〜5日
初心者へのやさしさ
30/100
issue の種類
バグ
明瞭さ
おおむね明確
活発さ
停滞
技術スタック
javascript, linux
領域
desktop-dev

調査の方向性

Run sandbox/run-suite.sh 18 from forge-repro to observe overlap episodes per scenario. Acceptance criteria require no tiled overlap at any frame. The linked PR #570 already implements a fix, so pick up from there rather than starting fresh; no forge source file is named in the issue.

索引モデルが issue の本文から書いたものです。

説明

Problem. When Forge changes the layout (a window opens or closes, a container is resized), it asks every affected window for its new place at the same moment. Apps take a frame or more to draw their new size, and GNOME keeps showing a Wayland window at its old place and size until the app has drawn it. X11 apps, by contrast, move at once. So a window that grows into the space its neighbour gives up is drawn over that neighbour until the neighbour has redrawn.

Usually that is one to three frames. While a resize key repeats, Forge sends a new place before the app has drawn the last one, and GTK apps (Ptyxis, Files, Text Editor) fall behind by up to about a second. Example: hold Super+Ctrl+Left on a window with a terminal to its left and VS Code below it. VS Code (X11) follows every step at once, and the terminal lags, so VS Code covers the terminal by hundreds of pixels for seconds.

holding a resize key next to a slow app: the fast window covers the slow one; with the fix it waits

Desired outcome. A layout change never shows one tiled window on top of another. While an app catches up there may be a gap (the wallpaper shows briefly), never an overlap. The final layout and the speed of resizing are unchanged.

Acceptance criteria.

  • Holding a resize key between a GTK app and an X11 app: no overlap at any moment, and no check on the layout reported by GNOME fails.
  • Opening, closing and moving windows: no overlap longer than one frame.
  • A window whose app never redraws doesn't hold the others back for more than half a second.
  • Windows that swap places (move left/right) still swap immediately.
  • All layout scenarios still pass.

Reproduction: scenarios/18_slow_redraw_overlap.py, which uses a test app that takes 120 ms to follow each new size, next to a fast window. Or, with real apps, scenarios/07_real_apps.py (7v.4) on a large screen. sandbox/run-suite.sh 18 also reports every overlap episode per scenario.

主要言語
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