QA 17 — Edge Cases & Performance

How to run
Checklist

How to run

emacs --no-init-file -l qa/17-edge-cases/test.el
EMACS_GPU_DISABLE=1 emacs --no-init-file -l qa/17-edge-cases/test.el

Checklist

TODO 17.1 Large buffer — no lag on scroll

Press l to load the 5000-line buffer. Scrolling with C-v / M-v must feel instant (no multi-second freezes). Failure: visible lag > 0.5s per scroll step.

TODO 17.2 Large buffer — correct rendering throughout

Scroll through the entire large buffer. Every line must render correctly; no lines may appear garbled or blank mid-buffer. Failure: garbled lines appear after extended scrolling.

TODO 17.3 Glyph atlas stress — many fonts and sizes

Press f to open the font stress test (many different faces/sizes). All glyphs must render correctly even after the atlas may have reset. Failure: some glyphs appear as blank squares after the atlas overflows.

TODO 17.4 Theme switch — no residual artifacts

Press m for modus-vivendi (dark) then o for modus-operandi (light). All colors must update immediately with no artifacts from the previous theme. Failure: old-theme colors remain in parts of the buffer.

TODO 17.5 Iconify and restore — full redraw

Minimize the Emacs window and restore it. The full buffer must be redrawn correctly after restore. Failure: parts of the buffer remain blank or show garbled content.

TODO 17.6 Rapid buffer switching — no flash

Press r to start rapid buffer cycling (10 switches per second). No flash or blank frame should be visible between switches. Failure: visible white or black frame appears during cycling.

TODO 17.7 Simultaneous overlays + hl-line — no interference

Press x to add 50 random overlays across the buffer. hl-line highlighting must still correctly highlight the cursor line. Failure: hl-line disappears, or overlays cause garbled rendering.

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