The following (run as a script) used to cause a crash due to :sign using a
special redraw (not updating nvim's specific highlight data structures)
without proper redraw first, as split just flags for redraw later.
set cursorline
sign define piet text=>> texthl=Search
split
sign place 3 line=2 name=piet buffer=1
Hope this will make people using feed_command less likely: this hides bugs.
Already found at least two:
1. msgpackparse() will show internal error: hash_add() in case of duplicate
keys, though it will still work correctly. Currently silenced.
2. ttimeoutlen was spelled incorrectly, resulting in option not being set when
expected. Test was still functioning somehow though. Currently fixed.
It is otherwise impossible to determine which test failed sanitizer/valgrind
check. test/functional/helpers.lua module return was changed so that tests which
do not provide after_each function to get new check will automatically fail.
