patch 8.2.2340: win_execute() unexpectedly returns number zero when failing Commit: https://github.com/vim/vim/commit/37487e16da7877129edee8d11b9b7f5c8df312c6 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Jan 12 22:08:53 2021 +0100 patch 8.2.2340: win_execute() unexpectedly returns number zero when failing Problem: win_execute() unexpectedly returns number zero when failing. Solution: Return an empty string. (closes https://github.com/vim/vim/issues/7665)

--- a/src/testdir/test_execute_func.vim
+++ b/src/testdir/test_execute_func.vim
@@ -89,6 +89,8 @@ func Test_win_execute()
   call win_gotoid(thiswin)
   let line = win_execute(otherwin, 'echo getline(1)')
   call assert_match('the new window', line)
+  let line = win_execute(134343, 'echo getline(1)')
+  call assert_equal('', line)
 
   if has('popupwin')
     let popupwin = popup_create('the popup win', {'line': 2, 'col': 3})