Comment 11 for bug 1777328

another observation (ubuntu studio, X11):
window with custom size > maximize = maximized window
window maximized > F11 = fullscreen
fullscreen > F11 = window with custom size

window with custom size > reload skin = window at minimal size (set by skin)

some hopefully helpful input before I work on it myself:
https://stackoverflow.com/questions/38182367/how-to-toggle-a-window-from-fullscreen-to-normal-mode-programmatically#38182513

maybe we should do this when reloading the main window:
* if fullscreen: leave fullscreen, restore minimal size (un-maximize)
* if maximized: restore minimal size (un-maximize), store maximize state
(* not fullscreen, not maximized: store window size (as it does now))
X reload skin
(should be at normal size now)
* enter fullscreen mode or restore maximize state