fix: respect playback state after dragging seekbar

[Samillion]

Fixes: #513

Changes:

• Keep track of pause state when a drag event occurs, to respect playback state after event ends with mouse_seek_pause=yes

[nekoxuee]

I was trying to find what did I do to fix this a few months ago, but can't find the changes because I did a single commit with a lot of changes and I don't remember.

Doing it this way seems to work, and the icon doesn't change while paused and dragging. Don't know if there are any drawbacks.

- state.playing_and_seeking = true
-    if mp.get_property("pause") == "no" and user_opts.mouse_seek_pause then
+ if not state.playing_and_seeking and mp.get_property("pause") == "no" and user_opts.mouse_seek_pause then
+    state.playing_and_seeking = true

[InterestingFallacy]

Change in PR works.
@Xurdejl's change crashes script when applied on top of current Master.

[Samillion]

@Xurdejl's change crashes script when applied on top of current Master.

Out of curiosity, could you share the trace for the crash? I'm not at home right now so I'm unable to test.

If it's not a bother, of course.