Stephen A Pohl
5c406a7341
After a top-level navigation, the new PresShell has no per-PresShell mouse state until a real mouse event arrives. PresShell::SynthesizeMouseMove bails on that empty state, so a JS-driven cursor or :hover change (e.g. `body.style.cursor = 'none'` triggered by a keypress) does not take effect until the user moves the mouse. PointerEventHandler still holds the static last-mouse state from before the navigation. When the previous owning PresShell has been torn down, claim that state for the new PresShell. The existing path in ProcessSynthMouseMoveEvent then dispatches a synthetic eMouseMove at the cached position. Gate the claim with three checks. Skip if another live PresShell still owns the state (e.g. a popup). Skip unless the widget that originally recorded the state matches aRootPresShell's widget, since PresShell::IsRoot() means root of the in-process presContext tree and the previous owner could have been on a different top-level window in the same content process. And use a new sLastMousePointerId static for the recovered pointerId, since sLastPointerId tracks any pointer (including touch) and would mismatch the eMouseMove dispatched downstream. Differential Revision: https://phabricator.services.mozilla.com/D301688
67 lines
2.3 KiB
HTML
67 lines
2.3 KiB
HTML
<!doctype html>
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<style>
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html, body { margin: 0; padding: 0; height: 100%; }
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body { background: white; }
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body:hover { background: red; }
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</style>
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<script src="/tests/SimpleTest/SimpleTest.js"></script>
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<script src="/tests/SimpleTest/EventUtils.js"></script>
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<script>
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async function runTest() {
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const isReloaded = sessionStorage.getItem("bug2038491_reloaded") === "true";
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if (!isReloaded) {
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// First load: synthesize a real mouse move at a known position so the
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// root PresShell records the mouse state, then reload to drop that
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// PresShell.
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synthesizeMouse(document.body, 100, 100, { type: "mousemove" });
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// Wait one paint tick so the synth move propagates and :hover is applied.
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await new Promise(r => requestAnimationFrame(r));
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await new Promise(r => requestAnimationFrame(r));
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const bg = getComputedStyle(document.body).backgroundColor;
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if (bg !== "rgb(255, 0, 0)") {
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opener.reportResult(
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false,
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`Setup: body should be red (hovered) after initial mouse move, got ${bg}`
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);
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window.close();
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return;
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}
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sessionStorage.setItem("bug2038491_reloaded", "true");
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location.reload();
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return;
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}
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// Second load: the new root PresShell has no per-PresShell mouse state.
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// PointerEventHandler::sLastMouseInfo still holds the cached position from
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// before the reload, with a dead weak ref to the old PresShell. The fix
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// for bug 2038491 lets PresShell::SynthesizeMouseMove claim that orphaned
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// state. PresShell::UnsuppressAndInvalidate calls SynthesizeMouseMove
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// when painting unsuppresses; with the fix in place a synthetic eMouseMove
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// dispatches and re-evaluates :hover on the new document.
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// Give the refresh driver several ticks to dispatch the synthetic mouse
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// move.
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for (let i = 0; i < 10; i++) {
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await new Promise(r => requestAnimationFrame(r));
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}
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const bg = getComputedStyle(document.body).backgroundColor;
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const passed = bg === "rgb(255, 0, 0)";
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sessionStorage.removeItem("bug2038491_reloaded");
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opener.reportResult(
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passed,
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passed
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? "body is red (hovered) after navigation without a fresh mouse move"
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: `body should be red (hovered) after navigation, got ${bg}`
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);
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window.close();
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}
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SimpleTest.waitForFocus(runTest);
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</script>
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<body></body>
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