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)
Create a new dialog to edit global and project specific symbol library
tables.
Add menu entries for new symbol library table editor in schematic editor
and symbol library editor main frame menus.
Add command event handler for symbol library table editor dialog to
SCH_BASE_FRAME so it is accessible from derived frames.
Fix bug in default environment variables initialization. A test for
existing user defined environment variables was preventing any new
default environment variables added to the list from being initialized.