This adds an icon to the left of the row with an error symbol if the
file can't be found or opened, and shows a tooltip over the icon with
and error string.
Fixes https://gitlab.com/kicad/code/kicad/issues/3815
wxWidgets has several bugs that result in cell editors being closed
right after they're opened. There are two wxWidgets hacks to
partially address this: the SetInSetFocus() hack, and a slow-click
hack. We used to try and work-around these bugs ourselves for
single-click access, but this changelist moves those over to
wxWidget's slow-click hack.
Fixes: lp:1817965
* https://bugs.launchpad.net/kicad/+bug/1817965
Allow copy of a single cell demarcated by the grid cursor.
Paste of lib_table s-expressions should always start at 0,0.
Let caller or specialized sub-class do auto-sizing; don’t
do it from within the base GRID_TRICKS.
Don’t start GRID_TRICKS menu IDs at -1; wxWidgets doesn’t
like it when you get to 0.
Add column visibility menu.
(cherry picked from commit e5071ed)