Add setTimeout for mousemove handler

[AlexanderReznik]

Fixes

Selection is getting stuck and the page is not getting scrolled automatically

Happens in Chrome, not in Firefox
The problem is that the order of events mousemove and selectionchange is not deterministic. When mousemove is handled before it prevents selectionchange handler from executing fully resulting in this bug.

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[ivailop7]

LGTM

[StyleT]

Hi! Thanks for the PR! Do you think it's possible to add test here to prevent future regression?

[AlexanderReznik]

Do you think it's possible to add test here to prevent future regression?

I've tried, couldn't add a test for the mouse leaving the window to cause a scroll

[StyleT]

Do you think it's possible to add test here to prevent future regression?

I've tried, couldn't add a test for the mouse leaving the window to cause a scroll

No worries, can you pls then add a code comment to explain setTimeout presence and TODO with newly created issue number that shall address lack of test here. So someone else (maybe me), can take a look at the test.

I'll merge it right after you have comment + follow up issue to write test.

[AlexanderReznik]

No worries, can you pls then add a code comment to explain setTimeout presence and TODO with newly created issue number that shall address lack of test here. So someone else (maybe me), can take a look at the test.

#5928
c626b1b