112148 - Scroll bars no longer shown in 0.9.6

Status: RESOLVED DUPLICATE of bug 109808

(Core :: CSS Parsing and Computation, defect)

Description

[Sampo Syreeni]

After I switched from 0.9.5-MathML to 0.9.6-MathML, scrollers no longer show on
my site. The stylesheet used is a complex one, so I'm not entirely sure about
all the interactions, but it seems there is something very weird about all this.

The trouble seems to come from the first sheet referenced in the xhtml files,
http://www.helsinki.fi/~ssyreeni/shared/style/dc-mono/dc-mono-11-screen-xstruct.css.
That one includes two others in the same directory,
dc-mono-11-basis-xstruct.css, and dc-mono-11-visual-xstruct.css. The second
starts with a hideously long initialization rule which matches all elements. If
I remove the part which says "width:auto; background:transparent none repeat
scroll 0 0;", the scroll bar returns, but is a bit faulty. If I similarly edit
the first file, and remove part saying "display:inline" from another init rule,
I can again get the normal, working scroll bar.

As I said, this did not happen in earlier Mozilla versions. I also cannot see
 why the above settings should affect whether scroll bars are visible or not,
especially since removing only the "width:auto" and "display:inline" settings
will *not* cause the scroll bar to return.

This last point causes me to think that this might not in fact be a pure
scroller problem, but might also indicate some sort of cascade bug -- my current
sheet is a veritable monster as far as the cascade is concerned.

Comment 1

[Boris Zbarsky [:bzbarsky]]

Is the problem here that * is matching the viewport?

Comment 2

[Sampo Syreeni]

If there's been a change in that since 0.9.5, maybe. Still, I do not understand
what the background property has to do with it. If you have something on this
viewport stuff, pass a link, will you?

Comment 3

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

I'm wondering if fantasai's patch in bug 109808 will help this.  Hopefully I'll
check it in today and maybe I'll remember to test this when I do...

Comment 4

[Karl Johan Kleist]

Please also note Bug 112245.

Comment 5

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

This should be better in tomorrow's build.

*** This bug has been marked as a duplicate of 109808 ***