emacs-gpu-qa/01-render-cycle/README.org

QA 01 — Render Cycle & Present

• How to run
• Checklist
  • 1.1 No black flash on startup
  • 1.2 No content flash when switching buffers
  • 1.3 No black band on WM resize
  • 1.4 No flash when toggling tab-bar
  • 1.5 No flash when opening / closing the minibuffer
  • 1.6 Mouse-face does not flicker
  • 1.7 Iconify and restore

How to run

emacs --no-init-file -l qa/01-render-cycle/test.el
EMACS_GPU_DISABLE=1 emacs --no-init-file -l qa/01-render-cycle/test.el

Follow the interactive steps printed in the *QA: Render Cycle* buffer.

Checklist

TODO 1.1 No black flash on startup

The window must be fully painted before it becomes visible. Failure: a black or white frame appears for 1–2 vblanks then snaps to content.

TODO 1.2 No content flash when switching buffers

Press C-x b to go to *scratch*, then back. Failure: the previous buffer's content flickers in for one frame.

TODO 1.3 No black band on WM resize

Drag the window border with the mouse. Failure: a black or garbled band appears at the trailing edge during resize.

TODO 1.4 No flash when toggling tab-bar

Press C-x t t to toggle the tab-bar. Failure: a fully white frame flashes before the tab-bar appears.

TODO 1.5 No flash when opening / closing the minibuffer

Press M-x then C-g. Failure: the area below the last window flickers white or shows garbage.

TODO 1.6 Mouse-face does not flicker

Move the mouse slowly over the mode-line buttons or links in the buffer. Failure: highlight appears and immediately disappears for one frame before settling.

TODO 1.7 Iconify and restore

Minimize the window (C-z or WM title bar) and restore it. Failure: content is not redrawn correctly after restore.