Crash on opening 2 files via drag & drop #2548
Description
On my company laptop WinMerge often crashes when I drag 2 files into it. It doesn't happen every time, but it's frequent enough to easily reproduce.
There's nothing special about the files. Usually they are text files smaller than 1MB, but it also happens with other files (including with these crash dumps just now).
I was able to reproduce it on our Windows 11 environment.
Visually what happens is both files are loaded and the diffs are shown, but the window is immediately unresponsive and closes after about a second.
I've had it happen with fresh windows and with windows that already had comparisons open.