patch 8.0.0299: a window resize is sometimes not taking effect

Problem:    When the GUI window is resized Vim does not always take over the
            new size. (Luchr)
Solution:   Reset new_p_guifont in gui_resize_shell().  Call
            gui_may_resize_shell() in the main loop.

src/gui.c

@@ -1459,6 +1459,8 @@ gui_resize_shell(int pixel_width, int pixel_height)
     }
 
 again:
+    new_pixel_width = 0;
+    new_pixel_height = 0;
     busy = TRUE;
 
     /* Flush pending output before redrawing */
@@ -1468,8 +1470,8 @@ again:
     gui.num_rows = (pixel_height - gui_get_base_height()) / gui.char_height;
 
     gui_position_components(pixel_width);
-
     gui_reset_scroll_region();
+
     /*
      * At the "more" and ":confirm" prompt there is no redraw, put the cursor
      * at the last line here (why does it have to be one row too low?).
@@ -1491,17 +1493,22 @@ again:
 
     busy = FALSE;
 
-    /*
+    /* We may have been called again while redrawing the screen.
-     * We could have been called again while redrawing the screen.
+     * Need to do it all again with the latest size then.  But only if the size
-     * Need to do it all again with the latest size then.
+     * actually changed. */
-     */
     if (new_pixel_height)
     {
-	pixel_width = new_pixel_width;
+	if (pixel_width == new_pixel_width && pixel_height == new_pixel_height)
-	pixel_height = new_pixel_height;
+	{
-	new_pixel_width = 0;
+	    new_pixel_width = 0;
-	new_pixel_height = 0;
+	    new_pixel_height = 0;
-	goto again;
+	}
+	else
+	{
+	    pixel_width = new_pixel_width;
+	    pixel_height = new_pixel_height;
+	    goto again;
+	}
     }
 }
 
@@ -1511,18 +1518,10 @@ again:
     void
 gui_may_resize_shell(void)
 {
-    int		h, w;
-
     if (new_pixel_height)
-    {
 	/* careful: gui_resize_shell() may postpone the resize again if we
 	 * were called indirectly by it */
-	w = new_pixel_width;
+	gui_resize_shell(new_pixel_width, new_pixel_height);
-	h = new_pixel_height;
-	new_pixel_width = 0;
-	new_pixel_height = 0;
-	gui_resize_shell(w, h);
-    }
 }
 
     int

src/main.c

@@ -1118,6 +1118,10 @@ main_loop(
 	    skip_redraw = FALSE;
 	else if (do_redraw || stuff_empty())
 	{
+# ifdef FEAT_GUI
+	    /* If ui_breakcheck() was used a resize may have been postponed. */
+	    gui_may_resize_shell();
+# endif
 #if defined(FEAT_AUTOCMD) || defined(FEAT_CONCEAL)
 	    /* Trigger CursorMoved if the cursor moved. */
 	    if (!finish_op && (

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    299,
 /**/
     298,
 /**/