Filezilla freezes when deleting tabs

[Alex Cranswick]

First encountered this problem in 3.65.0 and went back to 3.63.2.1 but the issue has just happened again. FileZilla freezes when multiple connection tabs are open and you try to delete a tab. The problem is in reproducing the issue since it only seems to occur after FileZilla has been open for sometime. Shutting FileZilla down and re-initialising doesn't seem to solve the problem but an OS reboot does. I thought it might be happening due to the X on the tab to delete being hidden (window too narrow to display all tabs) and having to shift the tab bar to see the X, since that was the only time it seemed to happen, but I have disproved that at least immediately after starting FileZilla.