This moves EESchema DLIST structures to rtree. These changes are more
fundamental than the pcbnew changes from 9163ac543888c01d11d1877d7c1
and 961b22d60 as eeschema operations were more dependent on passing
drawing list references around with SCH_ITEM* objects.
For legacy reasons, it stored left and right "spin" as flipped integers in the file format.
But the code handled the flip in multiple locations rather than just doing it on file io.
This change unifies the internal code and does the mapping in the file I/O.
Change default text size and anchor positions back to mils. Internal
units need to be converted at the source, otherwise the size will get
converted twice in the schematic editor configuration code which will
result in the default text size being off by the conversion factor.
Fixes#3730https://gitlab.com/kicad/code/kicad/issues/3730#
The new connectivity algorithm had a tendency to cleanup
globally, but that could insert undo records from other sheets
into the current screen's undo stack. Needless to say, this
was a recipie for segfaults.
Fixes: lp:1846247
* https://bugs.launchpad.net/kicad/+bug/1846247
Seth Hillbrand
Mark Roszko
Wayne Stambaugh
Jeff Young