Start app with the correct controls layout instead of showing the "hide elapsed time"
transition when started on mobile width. It is annoying.
We cannot detect surface width during app widgets assembly, so update the controls
revealers state on first surface update after window is mapped and only if running
on mobile width. Otherwise do not do anything like before which will result in
showing fully revealed controls (default).
On some non-default system configurations the "menu" layout item might be replaced with one named "icon". Handle "icon" the same as "menu" when organizing headerbar buttons.
We do not know if the online URI still leads to the same file as before (or if different one leads to previous). Additionally we would also need to check if media is seekable. Disable for now to avoid problems.
Instead of providing URIs directly to GStreamer, follow redirects and provide that final URI. With this change souphttpsrc will not have to go through redirects from the beginning for each video segment.
Controls panel height is now 3px less then before (as intended). Change default window size setting to make it look good with 16:9 video on fresh install.
Otherwise we would keep checking the settings with each playlist file and accidentally entered fullscreen when that setting value was changed in middle of playback.
Otherwise GStreamer will error out and playback will stop. Non-existing subtitle file is common on Flatpak when user tries to open/drop a file from a folder that container does not have access to.
The window size was restored too early which caused the window to be a little bigger then it should on each launch. Restore window size after that window was mapped.
Play video with external subtiles by:
* selecting and opening both video+subs from file chooser/manager
* dropping subtitles file on player window
* opening subtiles from file chooser/manager while video plays
* send their file path/uri to player via WebSocket message
Emit media info updated signal only when media info is initially created and when number/format of tracks changes later. This is needed for GUI to detect resolution change (adaptive streaming) or when user adds external subtitles to current video.
