Problem: Moving the cursor in Insert mode starts new undo sequence.
Solution: Add CTRL-G U to keep the undo sequence for the following cursor
movement command. (Christian Brabandt)
Problem: 'langmap' is used in command-line mode when checking for mappings.
Issue 376.
Solution: Do not use 'langmap' in command-line mode. (Larry Velazquez)
Problem: Having CTRL-C interrupt or not does not check the mode of the
mapping. (Ingo Karkat)
Solution: Use a bitmask with the map mode. (Christian Brabandt)
