I'm still not very happy with the result:
<img width="760" alt="Screenshot 2023-08-21 at 22 19 22" src="https://github.com/geany/geany/assets/713965/ec1fa8fa-55ac-4e3c-a087-bfda3a8eba61">
I understand that seeing the signature may be useful in some cases (like multiple constructors) but it doesn't answer the question *where* will the jump go which is stupid when multiple files are involved (and going through the list and waiting for the tooltips to appear is tedious).
I'd suggest making this configurable so people can chose what fits their needs (I'd lean towards defaulting to the previous behavior). The tooltip could then show the other piece of information - for filename:line_number it would show the signature and for signature it would show filename:line_number (I don't think that it's necessary in the tooltip to show both, it's just an unnecessary duplication of information).
What do you think?