The open dialog is provided by the GTK library, not Geany itself. On my Linux box it shows a list of available protocols, but maybe GTK on Mac doesn't provide any such protocols, and hence the red background when you type `:`.
Maybe there is no list because nobody interfaced GTK to the relevant OSX libraries or because of permissions (OSX seems to be getting more restrictive on these things). -- 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/2482#issuecomment-618925495
