466525 - Plugin content overlapping or overlapped by elements with overflow=auto are locked when a ContentPolicy is installed

Status: RESOLVED WORKSFORME

(Core :: Web Painting, defect)

Description

[Giorgio Maone [:ma1]]

The test page contains two Flash embeds, one absolutely positioned over a div, the other statically placed under an absolutely positioned div.
Both the div elements are styled with { visibility: hidden; overflow: auto }.
When a content policy is installed, even if the div is not visible and placed *under* the embed, it somehow prevents the embed from receiving events and possibly from being painted.

Steps to reproduce:

1) Install AdBlock Plus, leaving it disabled from its own UI for minimal noise (alternatively you can install NoScript and allow scripts globally) 
2) open http://evil.hackademix.net/bugs/overflow_lock/
3) Try to hover or click the movie controls

Expected result: 
movie controls react (they become red, the volume slider shows up and so on).

Actual result:
On Windows, nothing happens and repainting artifact may be shown.
On Linux, nothing is rendered on the portions of the movie overlapped/overlapping with the div elements.

Either setting display: none or overflow: hidden on the divs "unlocks" the movies.

Mozilla/5.0 (Windows; U; Windows NT 5.2; en-US; rv:1.9.1b2pre) Gecko/20081124 Firefox/3.1b2pre

Shockwave Flash 10.0 r12

Comment 1

[Timothy Nikkel (:tnikkel)]

We've changed a ton of things here with widgets, I'd be surprised is this bug still existed.

Comment 2

[Wladimir Palant]

Attachment: Testcase

This is a slightly updated version of Giorgio's testcase - original YouTube links no longer work, changed to a link to some random video.

Comment 3

[Wladimir Palant]

Attachment: Minimal content policy for testing

This is a restartless extension implementing nsIContentPolicy, doesn't do anything beyond that. This one should trigger the issue even if no Adblock Plus or NoScript is installed.

Comment 4

[Wladimir Palant]

I don't see any issue in Firefox 10.0.2 on Windows 7 x64 with Flash 11.1 r102, both Flash objects react to mouse events. My guess would be that this issue has been indeed fixed long ago. Giorgio?

Comment 5

[Timothy Nikkel (:tnikkel)]

Thanks for testing.

I tested on Linux with AdBlock Plus installed and the testcase worked fine for me. I think thats enough to close this. If there is still a problem here please reopen.

Comment 6

[Giorgio Maone [:ma1]]

Yes, works for me too.