fix(hud): keep the HUD's size while it is dragged at fractional scaling

[EtienneLescot]

Summary

Dragging the HUD at 125 % grew its window by up to 2 px per step. Electron's setPosition() re-applies the size read back from getBounds(), and on Windows both pixel ↔ DIP conversions round that size outwards. The bar, centred and bottom-pinned, slid off the pointer, and the work-area clamp, which assumed the original size, let it end under the taskbar.

• The main process keeps the HUD's own DIP size: set at creation, then by each hud-overlay-set-size.
• Drag, re-clamp and resize move the window with setBounds at that size, never with a size read back from the window.
• 100 % is unaffected: Chromium skips the conversion at scale 1.

Related issue

Closes #1004

Type of change

• Bug fix

Release impact

• Patch

Desktop impact

• Windows

Testing

• New electron/windows.test.ts: the real IPC handlers against a fake window doing Chromium's 125 % conversions and Electron's own setPosition. A 40-step drag keeps the size within 1 px, and a long drag down keeps the bar above the taskbar. Both fail without the fix (+80 px, bar 100 px past the work area).
• Both tsc configs, Biome, the HUD tests.
• Not done: a real drag at 125 %.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Improved HUD positioning during dragging and resizing on Windows at 125% display scaling. The HUD now maintains its dimensions and stays aligned with the bottom of the work area, within one pixel.
  • Empty resize updates no longer interfere with subsequent dragging, helping the HUD remain responsive during window adjustments.

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• electron/windows.test.ts
• electron/windows.ts

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• electron/windows.test.ts

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📝 Walkthrough

Walkthrough

The HUD now uses its last requested dimensions when calculating bounds for reclamping, dragging, and resizing. Dragging applies the full computed rectangle. New Windows tests model 125% scaling and check window size and work-area limits.

Changes

Windows HUD dragging

Layer / File(s)	Summary
Track requested HUD dimensions electron/windows.ts	The HUD stores its requested dimensions and uses them for initialization, reclamping, and resize calculations. Resize requests with non-finite or non-positive dimensions are rejected.
Apply and test drag bounds electron/windows.ts, electron/windows.test.ts	Drag updates calculate and apply the full clamped rectangle. Windows tests model 125% scaling and check that repeated drags keep pixel dimensions within one pixel of their starting values, keep the bar bottom within one pixel of the work-area boundary, and ignore an empty size update before a later drag.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~12 minutes

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to 8f019

The HUD sizing changes preserve the requested dimensions through resizing and dragging, and invalid sizes are rejected. No actionable issue remains that should block merging.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main change: keeping the HUD size stable while dragging at fractional scaling.
Description check	✅ Passed	The description covers the change, linked issue, change type, release impact, Windows impact, and testing. It also states that a real drag at 125% scaling was not tested.
Linked Issues check	✅ Passed	Issue #1004 requires stable HUD size during drag, pointer-following movement, and work-area clamping. electron/windows.ts tracks the HUD's requested DIP size and uses it for drag bounds; drag moveme…
Out of Scope Changes check	✅ Passed	The changes in electron/windows.ts and electron/windows.test.ts address issue #1004. Rejecting empty size updates prevents invalid dimensions from affecting later movement, and its test covers tha…
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 2 files.

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @electron/windows.ts:
- Around line 336-351: Update the setHudOverlaySize IPC handler’s input
validation to reject width or height values less than or equal to zero,
alongside the existing finite-number checks. Return before calling
hudResizeBounds or storing dimensions for invalid sizes.

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• electron/windows.test.ts
• electron/windows.ts

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