The major changes compared to the Gtk+ 2 version are:
* Everything is ported to modern Gtk/Gdk API.
* GtkFontChooserDialog is used instead of deprecated GtkFontSelectionDialog.
* Hiding buttons on dialogs (like OK/Cancel) is no longer supported, as it is
impossible to do that with dialogs using GtkHeaderBars.
* Some workarounds were added to the QGtk3Theme constructor to correctly work
with Gtk+ 3.
[ChangeLog][Platform Specific Changes] The Gtk+ platform theme has been ported
to Gtk+ 3.
Change-Id: Iacb01279b6432e0901e3bb1353d5792543cc76e4
Done-with: J-P Nurmi <jpnurmi@theqtcompany.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Reviewed-by: Lisandro Damián Nicanor Pérez Meyer <perezmeyer@gmail.com>
Reviewed-by: J-P Nurmi <jpnurmi@theqtcompany.com>
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