Comment 14 for bug 1925379

I also had trouble getting that merge request to apply cleanly, so I just copied the affected file (gtk/gtkimcontextsimple.c) at the point of the commit you linked to, and overwrote the copy in Ubuntu's package. It seems there were a few other changes between Ubuntu's version and that commit.

I'm not familiar with the code, so I have no idea if all of those changes are needed, what the regression potential is, etc.