This feature is just about the only thing holding me back from switching away from another editor for everything, so I thought I would take a stab at it. I cloned master and added a wrapper for `[SCI_SETMULTIPLESELECTION](http://www.scintilla.org/ScintillaDoc.html#MultipleSelectionAndVirtualSpace)... in `sciwrappers.c` and unconditionally called it in `create_new_sci`, (presumably the final version should be behind a checkbox or something.) But that didn't appear to do anything, (specifically I tried Ctrl-clicking to place multiple cursors.) Just by searching "geany ctrl click" I found [this discussion thread](https://lists.geany.org/pipermail/users/2012-May/008026.html) that mentions that Ctrl-clicking is hardcoded to goto-tag and find-matching-brace depending where you click. So I found [the part of the code that does that](https://github.com/geany/geany/blob/dd58ab6f49e8b382d9278c3ebc533f08b8aec84e...) and removed it. But Ctrl-clicking still doesn't work. Per comments above I expected some parts not to play nicely with multiple selections, but I hoped what I did would be enough to get it working some of the time! I managed to make the small changes I did by just `grep`ping trough the code and checking that functions were called when I thought they were being called. Does anyone else with more knowledge of the codebase have any ideas what else might cause Ctrl-clicking not to work?
FWIW, [further on](https://lists.geany.org/pipermail/users/2012-May/008041.html) in that discussion I linked to, an `enable-multiselection` branch was mentioned. Now I don't know the history of this project, but that discussion is from 2012. Is there any chance that branch would be even slightly relevant to the current codebase, assuming the author still has it and can be contacted?