Problem: Items in a list given to :const can still be modified.
Solution: Work like ":lockvar! name" but don't lock referenced items.
Make locking a blob work.
021bda5671
Problem: :const cannot be followed by "| endif".
Solution: Check following command for :const. (closesvim/vim#5269)
Also fix completion after :const.
8f76e6b12b
Problem: Docs and tests for :const can be improved.
Solution: Improve documentation, add a few more tests. (Ryuichi Hayashida,
closesvim/vim#4551)
1c196e7b17