patch 9.1.0716: resetting setcellwidth() doesn't update the screen

Problem:  resetting setcellwidth() doesn't update the screen
Solution: Redraw after clearing the cellwidth table (Ken Takata)

closes: #15628

Signed-off-by: Ken Takata <[email protected]>
Signed-off-by: Christian Brabandt <[email protected]>

Author: k-takata

src/mbyte.c

@@ -5644,7 +5644,7 @@ f_setcellwidths(typval_T *argvars, typval_T *rettv UNUSED)
 	// Clearing the table.
 	VIM_CLEAR(cw_table);
 	cw_table_size = 0;
-	return;
+	goto done;
     }
 
     ptrs = ALLOC_MULT(listitem_T *, l->lv_len);
@@ -5756,6 +5756,7 @@ f_setcellwidths(typval_T *argvars, typval_T *rettv UNUSED)
     }
 
     vim_free(cw_table_save);
+done:
     changed_window_setting_all();
     redraw_all_later(UPD_CLEAR);
 }

src/testdir/test_utf8.vim

@@ -228,6 +228,9 @@ func Test_setcellwidths()
     call setcellwidths([[0x2103, 0x2103, 2]])
     redraw
     call assert_equal(19, wincol())
+    call setcellwidths([])
+    redraw
+    call assert_equal((aw == 'single') ? 10 : 19, wincol())
   endfor
   set ambiwidth& isprint&
 

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    716,
 /**/
     715,
 /**/