Bug 20229 – REGRESSION: WebKit double-draws selections in some cases

• Status: NEW
• Component: New Bugs

[Eric Seidel (no email)]

See the attached image.

Go to:
http://www.mathewgross.com/about
and select the top portion of the page.  Notice how the selection is drawn twice in some areas.  Firefox leaves large blank spaces (which isn't better).  But the double-draw makes the text hard to read.

WebKit should instead clip around the existing selection (I think) when drawing new selection rects so that they don't overlap.

[Eric Seidel (no email)]

Created attachment 22555 [details]
example of double-drawn selection

[Pierre-Luc Beaudoin]

It looks like the selection isn't double drawn but that it is drawn in a translucent way. What I see in your screen shot is a big selection for the 2nd line which overlaps the other line's selection.

I think this bug should be named "Overlapping selection highlight".  The bug might simply be that the 2nd line ("Submitted by Mathew Gross on February 18, 2008 - 4:01pm.") selection's highlight is too high.

[Dave Hyatt]

Confirmed.  One of the lines is getting a crazy tall selection highlight.  This is a regression from Safari 3.1.

[Dave Hyatt]

Padding and border on inline elements is being incorporated into selection top and bottom since we use overflow.  We need to change selection away from using painting overflow and to be its own unique values.

This is a regression because an empty inline element is now present (because of fixes to make sure those show up).  (<span class=taxonomy>)

[ivank]

I encountered a double-drawn selection when I was hiding and unhiding divs. I have a simple reproduction of this:

http://ludios.net/webkit_bugs/selection_bugs.html  (it is the first bug listed)

[Parag Radke]

Created attachment 133821 [details]
Proposed Patch

Patch to fix double-draws selections.

[Parag Radke]

This patch will cause some pixel tests to fail on chromium port because of propagation.

[WebKit Review Bot]

Comment on attachment 133821 [details]
Proposed Patch

Attachment 133821 [details] did not pass chromium-ews (chromium-xvfb):
Output: http://queues.webkit.org/results/12132863

New failing tests:
editing/pasteboard/subframe-dragndrop-1.html
editing/selection/3690703-2.html
editing/selection/3690703.html
editing/selection/inline-closest-leaf-child.html
fast/repaint/4774354.html
fast/replaced/selection-rect-transform.html
editing/selection/contains-boundaries.html
fast/repaint/block-selection-gap-in-composited-layer.html
fast/writing-mode/vertical-lr-replaced-selection.html
fast/replaced/selection-rect-in-table-cell.html
fast/writing-mode/horizontal-bt-replaced-selection.html
editing/selection/3690719.html
fast/replaced/selection-rect.html
fast/writing-mode/vertical-rl-replaced-selection.html

[WebKit Review Bot]

Created attachment 133831 [details]
Archive of layout-test-results from ec2-cr-linux-03

The attached test failures were seen while running run-webkit-tests on the chromium-ews.
Bot: ec2-cr-linux-03  Port: <class 'webkitpy.common.config.ports.ChromiumXVFBPort'>  Platform: Linux-2.6.35-28-virtual-x86_64-with-Ubuntu-10.10-maverick

[Parag Radke]

Comment on attachment 133821 [details]
Proposed Patch

This change is not correct to avoid double selection 'll upload a new patch for this.

[Alexey Proskuryakov]

*** Bug 270786 has been marked as a duplicate of this bug. ***