@gidzzz: progress bar i now playing window, should remain static and with fixed width... now (when listening to over 100 minute mixes), numbers which state a current time in song shrink a progress bar when supress that 100 minute (or add another digit)....
same is with numbers that represents a overall length of a track (on a right side of the progress bar)

now.... i have something else in mind for the portrait orientation, and with viewing a playlist in now playing window... (just a something to think about):
first of all, thank you for listening my advise about shrinking album art in portrait by tapping to show playlist instead of progress bar, BUT now i have maybe a better proposition for that:
how about this for example:
you are in now playing window, and progress bar is shown... you want to see playlist (current), and you tap on album art, and it show you in whole display, a current pls, with no album art, and with only that familiar PLAY button in lower right corner, that you press, and go back to progress bar, and album art.

in that way, you see a lot more of the pls, and you don't even need a control buttons in that view (tap on song is play by default)

i can explain you graphically if you don't understand anything from my post

best regards