376375 - Painting bug with scrollbar of iframe, using opacity

Status: RESOLVED FIXED

(Core :: Web Painting, defect, P3)

Description

[Martijn Wargers (dead)]

Attachment: testcase

See testcase, after 500ms you shouldn't see some strange white area in the scrollbars of the iframe at the right bottom, but that does happen here on winxp, using the classic theme with the latest trunk build.

There is no real regression range for this, before 2007-03-02, scrollbars with opacity were completely busted on the classic theme in winxp. Bug 339598 fixed that.

Comment 1

[Martijn Wargers (dead)]

Attachment: screenshot of what I mean

Comment 2

[Robert O'Callahan (:roc) (email my personal email if necessary)]

More likely than not a Windows theme painting bug.

Comment 3

[Martijn Wargers (dead)]

Attachment: testcase2

Something similar happens with a select drop down.

Comment 4

[Martijn Wargers (dead)]

Attachment: testcase3

I'm also seeing no painting of the scrollbar in this case when scrolling down in this testcase.

Comment 5

[Robert O'Callahan (:roc) (email my personal email if necessary)]

Attachment: fix

MoveTo followed by NewPath -> WRONG :-)

Comment 6

[Vladimir Vukicevic [:vlad] [:vladv] (needinfo me, slow to respond)]

Comment on attachment 304858 [details] [diff] [review]
fix

Doh.

Comment 7

[Robert O'Callahan (:roc) (email my personal email if necessary)]

checked in

Comment 8

[Robert O'Callahan (:roc) (email my personal email if necessary)]

I landed a reftest for this.

Comment 9

[Martijn Wargers (dead)]

But canvas drawWindow can't catch painting bugs, can it? Or this was a different kind of painting bug?

Comment 10

[Robert O'Callahan (:roc) (email my personal email if necessary)]

To be honest, I didn't reftest it with an old build. But I think drawWindow can catch this one.

drawWindow can't catch *invalidation* bugs, which your original testcase was, but the reftest I came up with was not an invalidation bug, it displays incorrectly out of the box.