Describe your feature request
I switched to foot about half a year ago from Konsole, and been loving it so far; I've replaced most of Konsole's tab/pane functionality with tmux, but one feature I miss is Konsole's "Show hint for terminal size after resizing" option/feature, which displays a small OSD box for about a second with the number of rows/columns like Size: <x> x <y> whenever the window is resized.
I know foot has --window-size-chars and initial-window-size-chars options, but it would be very useful sometimes to have a live display of this info during interactive resize and window snapping; it's useful for quickly setting a window to a certain size to test with some program, and for checking how many cells fit within a certain region of the display. I suppose ideally the feature would be off by default so as not to annoy users who like foot's uncluttered minimalism (also along the lines of minimalism, the Size: text could be omitted).
If you aren't familiar with the feature, I could provide a demo video.
(I will admit I took a stab at implementing it myself, but I do not think I have the skill, and I'm pretty sure even if I kludged it in my code would need to be thrown out and rewritten anyway...)