This change completely removes the LIB_ALIAS design pattern an replaces
it by allowing LIB_PART objects to inherit from other LIB_PART objects.
The initial implementation only allows for single inheritance and only
supports the mandatory fields in the derived part because that is all
that the current symbol library file format will support. Once the new
file format is implemented and saving to the old file format is deprecated,
more complex inheritance will be added. The LIB_ALIAS information saved
in the document files was move into the LIB_PART object. This change
impacts virtually every part of the schematic and symbol library editor
code so this commit message is woefully incomplete.
REMOVE: Removed the symbol aliases concept from the schematic and symbol
editors and the symbol viewer.
NEW: Replace the symbol alias concept with simple inheritance that allows
a library symbol to be derived from another library symbol.
For unknown reasons, GTK3 may send resize events when editing grid
fields. This can cause the grid editor to exit, losing the focus and
overwritting the characters at the next input.
We avoid this by filtering the size events when the size doesn't change.
Fixes: lp:1817810
* https://bugs.launchpad.net/kicad/+bug/1817810
Wayne Stambaugh
Jeff Young
Seth Hillbrand
Maciej Suminski
Simon Richter