Occasional crash when dragging worklist entries
In the 2.6.0-beta0+r35254 gtk+3.22 client (and an earlier gtk+3 client whose revision number I can't recall), attempting to drag&drop a worklist entry in either panel of the city production dialog sometimes causes a crash.
I have not been able to discern when exactly this happens. It seems to be pretty consistently reproducible by immediately trying to drag an entry direclty after founding your first city. Selecting an entry without dragging highly reduces the chances of a crash, even after closing and reopening the dialog. Reconnecting the client to a server where you already own a city also keeps the crash chances low. The crash still does happen occasionally, mainly when directly dragging without properly selecting an item first.
According to Visual Studio 2017's debugger, the crash is caused by an access violation at 0x0000000070EDE372 (libgdk-3-0.dll) in freeciv-gtk3.22.exe: 0xC0000005.