Deselect -- as opposite to Select All
Review Request #128923 - Created Sept. 15, 2016 and submitted
This patch implements the missing action "deselect" as the opposite of "select all" for the timeline. Similar to selectAll it is wired up to the default deselect action in KF5. This allows users to assign a keyboard shortcut; please note that the default KF5 shortcut for this is Shift+Ctrl+A.
Tested on recent Kdenlive git master on Kubuntu 16.04LTS with recent KF5 and Qt updates installed.