We cannot depend on the value saved by GStreamer, cause it is shared with all GStreamer based apps. Lets save the last value to gsettings instead to make sure this is the volume we used with this app. With this change we can also see the right volume on startup before media file is loaded (previously it was shown always as muted).
A simple borderless window floating on desktop. Window can be resized and moved by dragging. It also has some minimalistic controls showing on top of the video when cursor is hovering over it.\n\n This was a feature originally requested by @zahid1905.
When a media is changed, normally one would expect to create new radio buttons with video/audio/subtitle tracks names corresponding to current video, but this is inefficient. Destroying objects just to create similiar ones again does take a long time and might lead to memory leaks. That is why a better and faster approach is to simply edit already available objects to match our expectations instead. This commit does just that for tracks radio buttons.
Follow other GNOME apps designs by having fullscreen button on the right side of window header bar. The control panel had too many buttons already and we still need to make some space for playlist. This way "fullscreen" button will be on top bar while windowed and "unfullscreen" button will appear on the bottom right only when player entered fullscreen mode.
Create volume button with popover instead of using GTK provided volume button.
Creating new button with only needed elements is more efficient then removing unneeded items from pre-made volume button. This should also increase performance a little when changing volume, because now we generate new icon only when a change is needed. In pre-made button icon is regenerated on each volume change.
