FileChooser proxies generation radiobuttons spacing is clunky
In the media library's file chooser dialog, you can see the three radiobuttons at the bottom looking a bit "broken" in terms of design, they eat up a lot of space and the spacing between them is not required from a UX perspective:
The fix is to to remove the "row-spacing" property whose value was set to "10", in the Pitivi medialibrary's FileChooserExtraWidget. This is what it looks like with a value of 0:
If you wanted to be even more compact, you could replace the three radiobuttons by a combobox widget with a label, for example like this:
Proxies policy: [ Create proxies when the media format is not supported officially |V]
Alternatively the proxies radiobuttons could be put in the preview sidebar on the right, bottom-aligned and with a separator differentiating them from the clip-specific preview stuff above it. The sidebar is typically full of unused space whereas the bottom bar is quite space-constrained.