Sets the decoration layout for the title buttons.
This overrides the [[email protected]:gtk-decoration-layout] setting.
The format of the string is button names, separated by commas. A colon separates the buttons that should appear on the left from those on the right. Recognized button names are minimize, maximize, close and icon (the window icon).
For example, “icon:minimize,maximize,close” specifies a icon on the left, and minimize, maximize and close buttons on the right.
If [[email protected]:side] value is GTK_PACK_START, this will display the part
before the colon, otherwise after that.
| this |
a `GtkWindowControls` |
| layout |
a decoration layout, or null to unset the layout |