docs(agents): the HUD lift is a cursor poll now, not a WH_MOUSE_LL hook - #389
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#388 deleted `{ forward: true }`, and this section still described it: `forward` as `@platform darwin,win32`, "Windows installs a global WH_MOUSE_LL hook, macOS forwards through its own event path". None of that is true any more. The main process polls screen.getCursorScreenPoint() while the HUD is click-through and pushes the window-relative point to the renderer, which hit-tests it with elementFromPoint().closest("[data-hud-interactive='true']") -- one path, no platform branch. The RULE is untouched, and that is the part worth being explicit about: an agent still has to move the real cursor, because the poll reads the OS cursor position and CDP-injected input does not change it. Says so, and says what the mechanism used to be, so the next reader who finds `forward` in the git history knows this page is current rather than stale. Also corrects the window size while in here: 600x160 was wrong before #388 -- createHudOverlayWindow builds 820x560 and the renderer then resizes to fit its content (measured 904x698, bar at the bottom, empty reserve above).
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Included review availability: Your plan includes up to 4 reviews per rolling hour; 2 remain after this review. 📝 WalkthroughWalkthroughThe HUD documentation now describes content-sized resizing and cursor interaction through OS cursor polling and renderer hit-testing. It also records Windows and macOS support and disabled click-through on Linux. ChangesHUD documentation
Estimated code review effort: 1 (Trivial) | ~2 minutes Merge Risk: ⚪ Minimal · up to This PR corrects documentation for the HUD cursor-polling behavior and window dimensions without changing product behavior; no actionable merge-blocking risk remains after normal checks. Possibly related PRs
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Inline comments:
In `@AGENTS.md`:
- Line 117: Update the HUD input-transparency explanation to distinguish
CDP-based hover testing from general hit-test sampling: real OS cursor movement
is required for CDP-injected input to exercise the native click-through path,
but HUD resize or re-anchor events can also generate a new window-relative
cursor sample and trigger hit testing without cursor movement.
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AGENTS.md
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CodeRabbit caught an over-strong premise, and it traces back to a deliberate choice in #388: pollHudCursor dedupes on the window-relative point, not on the cursor, precisely because "hud-overlay-set-size" re-anchors the window on every content change and the bar can arrive under a pointer that never moved. So "what lifts the input-transparency is a change in the OS cursor position" was not true -- a resize or re-anchor produces a fresh sample on its own. Reworded to what the poll actually reads, and the conclusion is now tied to the property that is airtight rather than to the one that is merely usual: synthesised input moves no pointer at all, so it can never put one on a control. That is what makes a passing injected click prove renderer wiring and not reachability, which is the whole reason this paragraph exists. No code change: a re-anchor lifting click-through is correct -- the pointer IS over the bar once the bar has moved under it.
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Summary
Doc rot created by #388. The HUD section of
AGENTS.mdstill described the mechanism that PR deleted:None of that is true any more.
setIgnoreMouseEventsis called with no options; the main process pollsscreen.getCursorScreenPoint()while the HUD is click-through and pushes the window-relative point to the renderer, which hit-tests it withelementFromPoint(…).closest("[data-hud-interactive='true']"). One path, no platform branch.The rule for an agent is unchanged, and that is the part worth being explicit about rather than quietly rewriting: you still have to move the real cursor, because the poll reads the OS cursor position and CDP-injected input does not change it. The page now says that, and says what the mechanism used to be — so the next reader who finds
forwardin the git history can tell this page is current rather than stale.Also corrects the window size, which was wrong before #388 too:
createHudOverlayWindowbuilds 820×560, not 600×160, and the renderer then resizes to fit its content (measured 904×698 during #388's verification, bar at the bottom with mostly empty reserve above).Related issue
Refs #385
Type of change
Release impact
Desktop impact
Screenshots / video
n/a — documentation only.
Testing
No code changed. The three factual claims are checked against the tree at
main:electron/windows.ts— thehud-overlay-cursorpoll andsetIgnoreMouseEvents(ignore)with no options.src/components/launch/LaunchWindow.tsx— theelementFromPointhit test and the!enabled && !isLinuxHudLinux no-op.createHudOverlayWindow—windowWidth = 820,windowHeight = 560.Summary by CodeRabbit