vim-patch:8.2.1984: cannot use :vimgrep in omni completion

Problem:    Cannot use :vimgrep in omni completion, causing C completion to
            fail.
Solution:   Add the EX_LOCK_OK flag to :vimgrep. (closes vim/vim#7292)
33aecb1f2c

Cherry-pick Test_resize_from_copen() indent change from patch 8.2.1432.

src/nvim/ex_cmds.lua

@@ -1636,13 +1636,13 @@ module.cmds = {
   },
   {
     command='lvimgrep',
-    flags=bit.bor(RANGE, BANG, NEEDARG, EXTRA, NOTRLCOM, TRLBAR, XFILE),
+    flags=bit.bor(RANGE, BANG, NEEDARG, EXTRA, NOTRLCOM, TRLBAR, XFILE, LOCK_OK),
     addr_type='ADDR_OTHER',
     func='ex_vimgrep',
   },
   {
     command='lvimgrepadd',
-    flags=bit.bor(RANGE, BANG, NEEDARG, EXTRA, NOTRLCOM, TRLBAR, XFILE),
+    flags=bit.bor(RANGE, BANG, NEEDARG, EXTRA, NOTRLCOM, TRLBAR, XFILE, LOCK_OK),
     addr_type='ADDR_OTHER',
     func='ex_vimgrep',
   },
@@ -3073,13 +3073,13 @@ module.cmds = {
   },
   {
     command='vimgrep',
-    flags=bit.bor(RANGE, BANG, NEEDARG, EXTRA, NOTRLCOM, TRLBAR, XFILE),
+    flags=bit.bor(RANGE, BANG, NEEDARG, EXTRA, NOTRLCOM, TRLBAR, XFILE, LOCK_OK),
     addr_type='ADDR_OTHER',
     func='ex_vimgrep',
   },
   {
     command='vimgrepadd',
-    flags=bit.bor(RANGE, BANG, NEEDARG, EXTRA, NOTRLCOM, TRLBAR, XFILE),
+    flags=bit.bor(RANGE, BANG, NEEDARG, EXTRA, NOTRLCOM, TRLBAR, XFILE, LOCK_OK),
     addr_type='ADDR_OTHER',
     func='ex_vimgrep',
   },

src/nvim/testdir/test_quickfix.vim

@@ -3124,20 +3124,80 @@ func Test_file_from_copen()
 endfunc
 
 func Test_resize_from_copen()
+  augroup QF_Test
+    au!
+    au FileType qf resize 5
+  augroup END
+  try
+    " This should succeed without any exception.  No other buffers are
+    " involved in the autocmd.
+    copen
+  finally
     augroup QF_Test
-	au!
+      au!
-        au FileType qf resize 5
     augroup END
-    try
+    augroup! QF_Test
-	" This should succeed without any exception.  No other buffers are
+  endtry
-	" involved in the autocmd.
+endfunc
-	copen
+
-    finally
+func Test_vimgrep_with_textlock()
-	augroup QF_Test
+  new
-	    au!
+
-	augroup END
+  " Simple way to execute something with "textwinlock" set.
-	augroup! QF_Test
+  " Check that vimgrep without jumping can be executed.
-    endtry
+  au InsertCharPre * vimgrep /RunTheTest/j runtest.vim
+  normal ax
+  let qflist = getqflist()
+  call assert_true(len(qflist) > 0)
+  call assert_match('RunTheTest', qflist[0].text)
+  call setqflist([], 'r')
+  au! InsertCharPre
+
+  " Check that vimgrepadd without jumping can be executed.
+  au InsertCharPre * vimgrepadd /RunTheTest/j runtest.vim
+  normal ax
+  let qflist = getqflist()
+  call assert_true(len(qflist) > 0)
+  call assert_match('RunTheTest', qflist[0].text)
+  call setqflist([], 'r')
+  au! InsertCharPre
+
+  " Check that lvimgrep without jumping can be executed.
+  au InsertCharPre * lvimgrep /RunTheTest/j runtest.vim
+  normal ax
+  let qflist = getloclist(0)
+  call assert_true(len(qflist) > 0)
+  call assert_match('RunTheTest', qflist[0].text)
+  call setloclist(0, [], 'r')
+  au! InsertCharPre
+
+  " Check that lvimgrepadd without jumping can be executed.
+  au InsertCharPre * lvimgrepadd /RunTheTest/j runtest.vim
+  normal ax
+  let qflist = getloclist(0)
+  call assert_true(len(qflist) > 0)
+  call assert_match('RunTheTest', qflist[0].text)
+  call setloclist(0, [], 'r')
+  au! InsertCharPre
+
+  " trying to jump will give an error
+  au InsertCharPre * vimgrep /RunTheTest/ runtest.vim
+  call assert_fails('normal ax', 'E565:')
+  au! InsertCharPre
+
+  au InsertCharPre * vimgrepadd /RunTheTest/ runtest.vim
+  call assert_fails('normal ax', 'E565:')
+  au! InsertCharPre
+
+  au InsertCharPre * lvimgrep /RunTheTest/ runtest.vim
+  call assert_fails('normal ax', 'E565:')
+  au! InsertCharPre
+
+  au InsertCharPre * lvimgrepadd /RunTheTest/ runtest.vim
+  call assert_fails('normal ax', 'E565:')
+  au! InsertCharPre
+
+  bwipe!
 endfunc
 
 " Tests for the quickfix buffer b:changedtick variable