548557 - Mouse pointer coordinates misaligned with Silverlight plugin

Status: RESOLVED DUPLICATE of bug 536429

(Core Graveyard :: Plug-ins, defect)

Description

[IU]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.3a2pre) Gecko/20100224 BetterPrivacy-1.47 Minefield/3.7a2pre
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.3a2pre) Gecko/20100224 BetterPrivacy-1.47 Minefield/3.7a2pre ID:20100224060607

The mouse coordinates are misaligned for the Silverlight plugin on the
Silverlight Showcase page.

Tested using Silverlight 4 Beta plugin.

Regression range:

Works:
2009/06/2009-06-26-04-mozilla-central
http://hg.mozilla.org/mozilla-central/rev/a55b20529273

Fails:
2009/06/2009-06-27-04-mozilla-central
http://hg.mozilla.org/mozilla-central/rev/b8cbe3c9542b

http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=a55b20529273&tochange=b8cbe3c9542b

Could this be a regression from Bug 500672?


Reproducible: Always

Steps to Reproduce:
1. Visit the linked URL
2. Wait for the "Showcase" Silverlight plugin to fully load
3. Make sure the page is sufficiently scrollable.  That is, do NOT maximize the display of the page, to the point where you do not need to scroll
4. Make sure the page is not centered (scroll it fully up or down)
5. Notice as you move your mouse from one end of each of those tiles to the
other (i.e. top to bottom, left to right) that the adjacent tile gets
highlighted/selected, without even pointing at it.
6. If you click any of the tiles, notice that you cannot click either the "View
Now" or close buttons, if you're directly over them.  You have to fish around
to find the point where the buttons get highlighted.

Comment 1

[IU]

The only likely culprit I can see in the pushlog for that range is bug 500672, so adding blocking.  Remove if you verify otherwise.

Comment 2

[Boris Zbarsky [:bzbarsky]]

Josh, can you take a look at this, please?

Comment 3

[Benjamin Smedberg]

Jim, this might be a clue what silverlight is doing.