Improve the behaviour of the "Set subtitle start & end" button
Pressing this button performs two actions: when pressed/released it sets the subtitle start/end.
If Video > Auto Select Subtitle is checked, playback may switch to the next subtitle after we set the subtitle start but before we set its end. So the start is set in a subtitle line, and the end in the next one, which doesn't seem useful in any use case.
Improvement: ignore "Auto Select Subtitle" while the button is pressed.
Edited by Pedro Castro