headerbar: support expand property for children

Desktop / GNOME / GTK - Ray Strode [redhat.com] - 24 June 2016 19:58 UTC

The header bar currently ignores the expand property on its children. This commit changes the code to honor that property.

It divvies up any free space and distributes it equally to packed children (with any left over space given out a pixel at a time on a first come, first serve basis).

This commit also adds support for the title widget to be made expandable.

It accomplishes this by using up the padding the title widget is centered with.

https://bugzilla.gnome.org/show_bug.cgi?id=724332

0015ebc headerbar: support expand property for children
docs/reference/gtk/migrating-3xtoy.xml | 7 ++++
gtk/gtkheaderbar.c | 59 ++++++++++++++++++++++++++++++++
2 files changed, 66 insertions(+)

Upstream: git.gnome.org

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