I have two screens, mIRC maximized on the secondary screen, script editor does NOT open on the desktop, but when minimized, the script editor window is shrunk to height = 0 and is placed on the left on main screen, on top of the taskbar, so far so good.
But in this situation, if you do not restore the window using the titlebar's button but instead if you go back to main mIRC and hit alt + r to open the script editor, the script editor gets scrolled horizontally.
Here is a video of it, the smaller rectangle in this video is the main screen:
https://www.dropbox.com/s/zjnvfhyox0p8703/2023-05-27%2016-48-59.mkv?dl=0
