Oh, fair enough, I thought it was working fine after I changed the mouse capture to go via the main frame. In that case I presume it has something to do with if the button up happens before the button down has been processed and the mouse has been captured then the button up gets sent to the window the pointer is in rather than the window that has (subsequently) captured the mouse. Whether the problem lies in wxWidgets or inside GTK itself I don’t know but I’ll report it on the wx-dev mailing list and see what they say...
owner-dev@xxxxxxxxxxxxxxxx [mailto:owner-dev@xxxxxxxxxxxxxxxx] On Behalf Of Neil Howe
Yes, but this isn’t a new problem. It’s always been like that since the color line was added for 0.3. I don’t think it’s any better or worse now.
Which reminds me I don’t think this is logged in Bugzilla so I’ll add it, though there is another mouse-up drag issue which may be related.