vim-patch:8.1.0965: search test fails

Problem:    Search test fails.
Solution:   Wait a bit longer for the 'ambiwidth' redraw.
e86ecbd922

src/nvim/testdir/test_search.vim

@@ -502,7 +502,7 @@ func Test_incsearch_with_change()
   let buf = RunVimInTerminal('-S Xis_change_script', {'rows': 9, 'cols': 70})
   " Give Vim a chance to redraw to get rid of the spaces in line 2 caused by
   " the 'ambiwidth' check.
-  sleep 100m
+  sleep 300m
 
   " Highlight X, it will be deleted by the timer callback.
   call term_sendkeys(buf, ':%s/X')