The bug is here in the quoting mechanism used to spawn commands, as it should have escaped the ``, not in allowing a backslash in the file name.
It's a mostly known bug that is unfortunately annoyingly hard to fix without risking to break existing setups or limiting valid use cases.
--- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/geany/geany/issues/1001#issuecomment-212147818