Better layout design / sizing and space usage for the importing file chooser's previewer widget
Submitted by Jeff F.T.
Assigned to Jeff F.T.
+++ This bug was initially created as a clone of Bug T2245 +++
When clicking "import", the file chooser now has a media previewer to make it easier for users to find what clip they want to import.
Currently, users can make the size of the preview widget bigger by clicking the zoom in/out buttons.
However, it would be more elegant and flexible if, instead of those buttons, the whole thing was inside a "hpaned" widget, and that whenever this widget is resized, the preview is resized to fit the available width.
Imported from https://bugzilla.gnome.org/show_bug.cgi?id=650806