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Fix flakiness in hit testing

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We need to make sure that hit testing from script reflects the latest display list we have sent from the compositor.
This commit is contained in:
Martin Robinson 2023-04-25 15:53:46 +02:00
parent 7114b31cf7
commit 7a778b2c29
26 changed files with 21 additions and 89 deletions
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12
components/compositing/compositor.rs
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@ -669,6 +669,18 @@ impl<Window: WindowMethods + ?Sized> IOCompositor<Window> {
flags,
sender,
)) => {
// When a display list is sent to WebRender, it starts scene building in a
// separate thread and then that display list is available for hit testing.
// Without flushing scene building, any hit test we do might be done against
// a previous scene, if the last one we sent hasn't finished building.
//
// TODO(mrobinson): Flushing all scene building is a big hammer here, because
// we might only be interested in a single pipeline. The only other option
// would be to listen to the TransactionNotifier for previous per-pipeline
// transactions, but that isn't easily compatible with the event loop wakeup
// mechanism from libserver.
self.webrender_api.flush_scene_builder();
let result = self.hit_test_at_point_with_flags_and_pipeline(point, flags, pipeline);
let _ = sender.send(result);
},