Bug 103680 – [CSS Regions] Text flickers outside of regions when resizing

• Status: RESOLVED
• Resolution: DUPLICATE
• Component: Layout and Rendering

[Rebecca Hauck]

Found in Version 25.0.1335.0 canary

1. Open the attached test file in the browser
2. Resize the window by dragging the bottom right corner (happens more reliably when you resize both horizontally & vertically at the same time, but I've seen it when doing just one direction at once, too)

Result:  The text momentarily flickers outside of the rightmost region while re-wrapping

[Rebecca Hauck]

Created attachment 176839 [details]
test case to reproduce bug

[Andrei Bucur]

The text overflowing the right region doesn't seem to repro after
http://trac.webkit.org/changeset/136793

However, what looks to be a flicker is the text in the right column "bouncing" vertically by 1/2 pixels when resizing the window. Is this a different bug?

[Rebecca Hauck]

I'm no longer seeing it flicker like I did before. I do see the slight bouncing in the right pink region though.  Should that be logged as separate bug?

[Andrei Bucur]

(In reply to comment #3)
> I'm no longer seeing it flicker like I did before. I do see the slight bouncing in the right pink region though.  Should that be logged as separate bug?

Yes. This can be either a subpixel layout problem or we don't do margin collapsing right at region breaks.

[Andrei Bucur]

(In reply to comment #4)
> (In reply to comment #3)
> > I'm no longer seeing it flicker like I did before. I do see the slight bouncing in the right pink region though.  Should that be logged as separate bug?
> 
> Yes. This can be either a subpixel layout problem or we don't do margin collapsing right at region breaks.

I've submitted a new bug: https://bugs.webkit.org/show_bug.cgi?id=104816

*** This bug has been marked as a duplicate of bug 103993 ***