Video Trimmer is now in GTK 4!

Amazing work by gtk-rs binding maintainers and new GTK 4 features like GtkMediaStream allowed me to make the code much simpler and slightly more GTK-idiomatic. Crashes from GtkGlSink's threaded GL usage should be gone too as GtkMediaStream uses a better architecture (I think).

The update is up on Flathub: flathub.org/apps/details/org.g

@Ivan Molodetskikh I think it's up to you how you want to prioritize the interaction modes. VideoTrimmer in its actual state emphasizes manual entry of the start and end points, because the interaction of the user is pointed to the input text box when opening the app. Which hot keys are available for escaping entering text into the text box? Ctrl and alt? Then one could imagine
Ctrl+i for setting the start point of selection to trim
Ctrl+o for setting the end point of selection to trim
Alt+i for jumping to the set start point (I think this is very helpful to check if the point is really well set)
Alt+o for jumping to the set end point
Ctrl+g for opening a popup text input field which asks to which time point you want to jump (because for that value, VideoTrimmer is not offering a text input field for manual entry yet)
Ctrl+t for trimming
Ctrl+z for undo trimming
Ctrl+[ play speed -10% (by using it again, play speed would be -20% and so on) (as done in SMPlayer)
Ctrl+] for play speed +10% (by using it again, playspeed would be +20% and so on)

MPEG Steamclip has an other approach, manual entry is not possible there. If you haven't used the software, I attach a screenshot of the whole interface for comparison. I like VideoTrimmers approach of providing manual entry.
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@emanuel Thanks for the detailed suggestion and the screenshot!

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