Also remove an implicit zone merge that was happening when the user
edited the zone parameters. This appears to have been a feature but it
happened without a) telling the user and b) having the option to prevent
it.
Fixes https://gitlab.com/kicad/code/kicad/issues/7661
This attempts to fix performance when importing large changesets from schematics.
The appearance control is a BOARD_LISTENER that would otherwise redraw per item imported which may cause lockups
It shows much more detail. Removes some nag dialogs and places
hypertext links in others.
Also fixes the auto-layer-showing to correctly show Edge.Cuts or
F.CrtYd or B.CrtYd for errors relating to them.
Fixes https://gitlab.com/kicad/code/kicad/issues/6446