Please always post version of Geany and Glib and GTK. I assume your new version is GTK3.
The mouse tab switching was removed by the GTK toolkit in GTK3, nothing we can do about it. -- 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/1778#issuecomment-367840166