Quick View popup closes and reopens when moving the mouse rightward

[njx]

1. Open a CSS file with some colors in it
2. Mouse over a color value so the Quick View appears
3. Move the mouse rightward over the color value

Result: When you get close to the right edge of the color value (without actually leaving it), the Quick View popup closes and reopens. This doesn't happen over the left edge.
Expected: Should stay open as long as you're over the value, and close when you move outside.

[njx]

Low priority to @redmunds (just picked you at random, feel free to reassign)

[peterflynn]

If we fixed #4656 it might make this bug invisible

[marcelgerber]

Sorry for the spam, but I just can't handle the git shell (maybe I should try a bit next time)... But this is the tested fix for this issue.

[redmunds]

I'm pretty sure that this was introduced with the fix for "QuickView appears when hovering past the end of a line" (#5102), so we'll need to make sure this is not broken with the fix for this one.

[redmunds]

FBNC back to @njx .

[marcelgerber]

The only problem left I can see is:

1. Type this in a new css file:
   background: #fff;
2. Hover over the semicolon

The QuickView is shown.
But I think that was there before, too.

[redmunds]

That's a known issue that's related to how CodeMirror determines what char the mouse is over.

[njx]

Confirmed, closing.