The way this method is used from the GtkRange subclasses doesn't really
work well when the slider properties change as a consequence of e.g. a
style class being applied (e.g. the fine-tune style class).
In fact, there's no need to read the minimum slider size out of band,
and we can obtain the same result in a way that always work by setting a
private property on GtkRange.
Since we can use negative margins, we should not use the margin box
for the slider area. Use the border box instead, since that's what is
typically mapped to the visible area.
This commit introduces another node, called "contents", that holds the
main contents of the range. This allows for the main gadget itself to
span across the whole surface of the widget now.
And reset the grab_location in the ::released handler of the multipress
gesture.
Previously, when leaving fine-tune mode, the ::released handler of the
multipress gesture would call stop_scrolling, which calls
range_grab_remove and resets the grab_location. The ::drag-end handler
is executed after that, and only unsets priv->in_drag if the
grab_location is MOUSE_OUTSIDE, which it never was, since the ::released
handler already reset it. This lead to priv->in_drag being set even
though no dragging was in progress anymore, which e.g. made shift
pressed after leaving the fine-tune mode entering it again.
https://bugzilla.gnome.org/show_bug.cgi?id=761402
Instead of having old and new style, now have a GtkCssStyleChange opaque
object that will compute the changes you are interested in for you.
This simplifies change signal handlers quite a bit and avoids lots of
repeated computation in every signal handler.
Use G_PARAM_DEPRECATED with deprecated style properties.
This will make it easier to identify and remove such stale
properties from css, since it will now trigger warnings.
The introduction of the trough node was not properly carried
into the code constructing stepper nodes, and was causing
assertion failures there. This was only showing up on Windows,
since Adwaita and HighContrast don't have steppers.
We were not queuing a draw (and not updating the CSS node) when
the slider visibility changed. This was exposed by the Trough
button in tests/testscale.
Fix this by taking slider visibility into account when deciding
whether to queue a draw in response to adjustment changes.
