vim-patch:8.1.0280: 'incsearch' highlighting does not work for ":g!/"

Problem:    'incsearch' highlighting does not work for ":g!/".
Solution:   Skip the exclamation mark. (Hirohito Higashi)
def7b1dc61

src/nvim/ex_getln.c

@@ -299,6 +299,13 @@ static bool do_incsearch_highlighting(int firstc, incsearch_state_T *s,
             && (STRNCMP(cmd, "substitute", p - cmd) == 0
                 || STRNCMP(cmd, "global", p - cmd) == 0
                 || STRNCMP(cmd, "vglobal", p - cmd) == 0)) {
+          // Check for "global!/".
+          if (*cmd == 'g' && *p == '!') {
+            p++;
+            if (*skipwhite(p) == NUL) {
+              return false;
+            }
+          }
           p = skipwhite(p);
           delim = *p++;
           end = skip_regexp(p, delim, p_magic, NULL);

src/nvim/testdir/test_search.vim

@@ -408,6 +408,14 @@ func Test_search_cmdline3g()
   undo
   call feedkeys(":global/the\<c-l>/d\<cr>", 'tx')
   call assert_equal('  3 the theother', getline(2))
+  undo
+  call feedkeys(":g!/the\<c-l>/d\<cr>", 'tx')
+  call assert_equal(1, line('$'))
+  call assert_equal('  2 the~e', getline(1))
+  undo
+  call feedkeys(":global!/the\<c-l>/d\<cr>", 'tx')
+  call assert_equal(1, line('$'))
+  call assert_equal('  2 the~e', getline(1))
 
   call Incsearch_cleanup()
 endfunc