Action Frame (Action Panel and Ring Menu): StyleAttribute for decoration

Window style attributes have been introduced to define the decoration for the ActionFrame: actionPanelDecoration and ringMenuDecoration.

The attributes define whether the Groupbox decoration is visible. These attribute can also define whether the action frame can be "undocked" by the user and moved around the window. Values can be:

• "auto" (default): left and right action frames have groupbox decoration, but top and bottom haven't.
• "yes": the groupbox decoration is always drawn.
• "no": the groupbox decoration is never drawn.
• "dockable": the action frame can be undocked, and has therefore a dedicated decoration.

<Style name="Window.dockAF">
  <StyleAttribute name="actionPanelDecoration" value="dockable" />
  <StyleAttribute name="ringMenuDecoration" value="dockable" />
</Style>