Fire mouseenter and mouseleave events
The PR primarily consists of changes for:
- Fixing the order in which `mousemove` events are fired.
- Firing `mouseenter` and `mouseleave` events.
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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix#26958
- [ ] There are tests for these changes