Bug 156988 – [GTK] Overlay scrollbars with steppers enabled render incorrectly

• Component: WebKitGTK
• Status: RESOLVED FIXED

[Adrian Perez]

Created attachment 277265 [details]
Incorrect on-hover scrollbar using the Zukitre theme

When hovering with the mouse over a scrollbar in Epiphany (or any other application
which uses WebKitGTK+) with certain themes the scrollbar will get thicker than in
normal (non-hovered) state. This happens both with vertical and horizontal scrollbars,
and also with scrollbars nested in an <iframe> or in an HTML element which has
“overflow: scroll” in its CSS rules.

First I thought that this was an issue with the Zukitre theme, but the author
of the theme noticed that setting “-GtkScrollbar-has-backward-stepper” and
“-GtkScrollbar-has-forward-stepper” to “true” seems to cause this issue in
any theme. More info: https://github.com/lassekongo83/zuki-themes/issues/62

[Carlos Garcia Campos]

I'm not surprised, steppers are untested, becase I had no idea how to test them :-P Has that Zukitre theme been adapted to new CSS in GTK 3.20 then?

[Adrian Perez]

Yes, the Zukitre theme is updated for GTK+ 3.20 and uses steppers. You can
install it from the “master” branch o the Git repository for testing this.

[Carlos Garcia Campos]

Created attachment 277356 [details]
Patch

[Michael Catanzaro]

Please throw this into 2.12.2 unreviewed; I'll look at it for trunk maybe tomorrow.

[Carlos Garcia Campos]

(In reply to comment #4)
> Please throw this into 2.12.2 unreviewed; I'll look at it for trunk maybe
> tomorrow.

No problem, I can wait for 2.12.2, I should also release 2.13.1 this week from trunk

[Michael Catanzaro]

Comment on attachment 277356 [details]
Patch

The theme code has reached the point where I hardly understand it anymore. :(

[Carlos Garcia Campos]

Committed r200173: <http://trac.webkit.org/changeset/200173>