desktoptoolbox: Add panel button
Adds a menu item for adding panels, to complement the one for adding widgets.
Requires plasma-workspace!3774 (merged).
(cherry picked from commit 0aa96e6e)
Adds a menu item for adding panels, to complement the one for adding widgets.
Requires plasma-workspace!3774 (merged).
(cherry picked from commit 0aa96e6e)