commit https://github.com/vim/vim/commit/7069bf18e1b1b7bc7640335e07d1022b5acc9048 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Jan 7 20:39:53 2017 +0100 patch 8.0.0150: completion for :filter does not skip the pattern Problem: When the pattern of :filter does not have a separator then completion of the command fails. Solution: Skip over the pattern. (Ozaki Kiichi, clodes #1299)

is<F4>foo
{'silent': 0, 'noremap': 0, 'lhs': 'foo<C-V>', 'mode': ' ', 'nowait': 0, 'expr': 0, 'sid': 0, 'rhs': 'is<F4>foo', 'buffer': 0}
{'silent': 1, 'noremap': 1, 'lhs': 'bar', 'mode': 'v', 'nowait': 0, 'expr': 1, 'sid': 0, 'rhs': 'isbar', 'buffer': 1}
{'silent': 0, 'noremap': 0, 'lhs': 'foo', 'mode': ' ', 'nowait': 1, 'expr': 0, 'sid': 0, 'rhs': 'bar', 'buffer': 1}
xrx
yRy
abcd