Comment 7 for bug 250769

Thanks to Benjamin, I now have swfdec-mozilla compiled (and producing some
nice effects when Mozilla doesn't crash).

The crash is happening because sometimes ws_info is not set up (in
nsObjectFrame::CallSetWindow()) and so it contains zeros when used in
nsPluginInstanceOwner::Paint().

The crash happens for plugins that are instantiated through
nsObjectFrame::Instantiate(nsIChannel* aChannel, nsIStreamListener** aStreamListener)
rather than
nsObjectFrame::Instantiate(const char* aMimeType, nsIURI* aURI)
as only the later does CallSetWindow() (and I don't know why that is).

With attachment 324576, gfxXlibNativeRenderer::Draw almost never uses its dpy
argument and so the crash reduces to

###!!! ASSERTION: Visual changed: colormap may not match: 'ws_info->visual == visual', file /home/karl/moz/mozilla/layout/generic/nsObjectFrame.cpp, line 4207

but still no useful info is available in ws_info for the plugin.

I can reproduce the assertion when scrolling to the first windowless plugin on
http://www.universfreebox.com/article5360.html, or on http://movies.yahoo.com/.