By putting the g_file_set_contents() into the worker thread. The main thread can wait for that to finish but in the meantime it can handle some other events. I see that it's difficult to block out UI actions that conflict with the saving. Your suggested modal dialog can work, however if some save options are not cancellable I'm not sure it buys us anything (besides presenting a dialog that tell the user why Geany is locked up)
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