patch 9.1.1069: preinsert text completions not deleted with <C-W>/<C-U>

Problem:  preinsert text completions not deleted with <C-W>/<C-U>
          (ddad431, after v9.1.1059)
Solution: handle <C-W> or <C-U> specifically and clear the completion
          (glepnir)

fixes: #16557
closes: #16565

Signed-off-by: glepnir <glephunter@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/insexpand.c

@@ -2498,6 +2498,9 @@ ins_compl_stop(int c, int prev_mode, int retval)
 	retval = TRUE;
     }
 
+    if ((c == Ctrl_W || c == Ctrl_U) && ins_compl_preinsert_effect())
+	ins_compl_delete();
+
     auto_format(FALSE, TRUE);
 
     // Trigger the CompleteDonePre event to give scripts a chance to

src/testdir/test_ins_complete.vim

@@ -3103,6 +3103,14 @@ function Test_completeopt_preinsert()
   call assert_equal("fo ", getline('.'))
   call assert_equal(3, col('.'))
 
+  call feedkeys("She\<C-X>\<C-N>\<C-U>", 'tx')
+  call assert_equal("", getline('.'))
+  call assert_equal(1, col('.'))
+
+  call feedkeys("She\<C-X>\<C-N>\<C-W>", 'tx')
+  call assert_equal("", getline('.'))
+  call assert_equal(1, col('.'))
+
   " whole line
   call feedkeys("Shello hero\<CR>\<C-X>\<C-L>", 'tx')
   call assert_equal("hello hero", getline('.'))

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1069,
 /**/
     1068,
 /**/