Changing code to agree with docs, which said frame.flat, was backwards.
Mea culpa. Theme authors ran with the actual behaviour, not the docs. As
stability is more important, let’s go back to frame > border.flat, and
fix the docs to reflect what the code does and how to set .flat in code.
N.B. This retains the change in HighContrast of "frame border" to "frame
> border". Not using the direct child selector contradicted Adwaita &
could conceivably have unwanted results on nested nodes named border.
https://bugzilla.gnome.org/show_bug.cgi?id=778905
The fact that it doesn’t reuse the existing GtkLabel if present is not
immediately obvious to users (or is it just me?), so clarify that the
pre-existing :label-widget, if any, is always removed and replaced.
Commit 0c20604932 changed the theme to expect the .flat class on
the frame node rather than the border one, but didn't update the
code that applies the style according to the :shadow-type property.
https://bugzilla.gnome.org/show_bug.cgi?id=779005
We were adding the border gadget size and the label widget size in any
case, but when calculating the width, we want the maximum of those two,
not the sum.
https://bugzilla.gnome.org/show_bug.cgi?id=760482
Setting label-yalign should affect the border gadget, but we need to
compensate for its position by moving the child down or up, depending on
the border gadget's position, so the child never moves.
https://bugzilla.gnome.org/show_bug.cgi?id=762123
As part of this conversion, remove the hardcoded padding around
the label.
Unfortunately, we cannot use the main gadget for drawing the frame
decoration, since we want to draw a custom border instead of the
stock css border that gadgets insist on drawing for us. Therefore,
add an extra gadget with name border and use it just for rendering
the frame.
Lots of applications often use GtkFrame as a giant toplevel container,
and that means that they get size allocated often. When frames get size
allocated, they invalidate their entire widget tree, even if they
haven't changed size or anything like that happens at all. This is
because the shadow / label needs to be redrawn if the child changes
size. We can optimize this out and only mark ourselves for a redraw if
the child has actually changed its size.
This avoids an evil trap when doing MAX (..., ... - 2 * border_width)
and the expression on the right gets promoted to unsigned, instead
of going negative as you would expect.
https://bugzilla.gnome.org/show_bug.cgi?id=699633
It already paints the css border, so let's make it also honor css
background. This is needed to have a box of a different color around
some widgets (e.g. latest gnome-clocks design)
The casting used to calculate the child allocation is confusing MAX().
As a result, width and height end up with negative values, which makes no sense.
https://bugzilla.gnome.org/show_bug.cgi?id=666109
Similar to GtkNotebook, GtkFrame was only allocating space for the
padding width, and not the border.
This could be seen by just running tests/testframe. With a theme that
renders frame borders, setting xthickness = 0 in the test draws the
button border over the frame border, which is wrong.
https://bugzilla.gnome.org/show_bug.cgi?id=664342
