Wrong behavious when docking / undocking playlist. Ends up showing a blank widget

Steps:
- Playlist, shown, undocked
- Start Video
- Dock Playlist
- Show Playlist
- Hide Playlist / Undock Playlist
- Stop Video
** problem1 : playlist shows, and is docked again
- Hide playlist
** problem2 : blank video widget instead of background

added Component::Interface: Qt Severity::minor Type::bug Version::master git + 1 deleted label

changed milestone to %Bugs paradize

commit 0ef62578 Author: Francois Cartegnie fcvlcdev@free.fr Date: Sat May 12 16:02:26 2012 +0200

Qt: main_interface: fix showTab(oldwidget) for undocked playlist (fix [#6794](https://code.videolan.org/videolan/vlc/-/issues/6794))

added Status::fixed label

closed

changed milestone to %2.0.2

changed the description