Scintilla (the editing component Geany uses) can do that. So it's a "mere matter" of adding UI capability to Geany (and design how it should actually work from a UI perspective).
And it possibly requires enhancing several parts of Geany so it plays nicely with multiple selections (I'm afraid a lot of our code was written carelessly to that regard, or even way before the feature even existed in Scintilla).
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