Progress bar does not scale correctly

[soraxas]

The progress bar for the windows theatre app does not scale properly after window-resizing.

See the following example:

1.
A video is first launched in window mode (the progress bar is correct in this instance) (window mode as in the window is floating and not filling up the entire screen)

2.
Then the window is then maximised (progress bar scale correctly to the full screen width)

3.
And after exiting the fullscreen mode and back into a window mode, the progress bar somehow seems to be still at the fullscreen scale. (you can see by the green bar. Seeking on that bar will act as if the bar is at fullscreen width)

Here and after, maximising and returning to floating mode will repeats stpe 2 and 3, and cannot return back to step 1 (i.e. correct scale of progress bar in floating mode) unless you close that video and open it again.