1) Tanks tor changelog links.
2) For bug tracking i agree not close until confirmed, but IMO it is good practice to update issues with a short note like
"we now made this change, see changelog URL xxx, hope it helps but not certain, so leaving bug open for a while"
3) Oops, i forgot to twist my fingers!
Running r4748 in qtcreator debug
I know that i never did a group delete this time.
I may have deleted some element.
I know i have deleted some conductors, especially the inferior one.
See image: at bottom there is a fat black conductor. I never made it fat. It was a normal default thin connector. A while after i had group moved some elements around that conductor, i noticed the conductor right vertical part was touching the dotted oval, so I grabbed that part and dragged it left.
But it did not follow nicely, instead the top part was still sticking out at right like in the picture. I then deleted it and made a new. At that time it looked like old one was gone, and only the new one visible (In this screen-shot you see the right vertical part of the new conductor slightly left of the old (fat) ghost conductor.
The old ghost get visible when i select the area.
Then i realised it may be this bug again, saved and yes it crashed.
No source file visible, just disassembler.
qtcreator "Application output" window displays:
QXcbConnection: XCB error: 3 (BadWindow), sequence: 34898, resource id: 43994263, major code: 40 (TranslateCoords), minor code: 0
...And then saves and exports every page, then:
pure virtual method called
terminate called without an active exception
EDIT: that code formatting function in this forum posting is a bit buggy, at least here on current Firefox... /EDIT
EDIT2: That ghost line shows in image exactly like when hoovering mouse over a conductor, but this is without hoovering the mouse over that ghost. /EDIT2