Like @eht16 I'm not sure I understand the problem, on Linux selections are always available for middle click paste, thats how the system works.
Please provide the operating system you are running on, the version of Geany and please test with _all_ plugins disabled. -- 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/2898#issuecomment-921341923
