Dialog: Apply `overflow: hidden` to contain the resize handles

Fixes #9521
Closes gh-1092

diff --git a/themes/base/jquery.ui.dialog.css b/themes/base/jquery.ui.dialog.css
index b49a4a76da14551190620f6a0bca67ca231e62af..0e4f8edce385e0ec40175eaa8adee3bcbc00d008 100644 (file)
--- a/themes/base/jquery.ui.dialog.css
+++ b/themes/base/jquery.ui.dialog.css
@@ -9,6 +9,7 @@
  * http://api.jqueryui.com/dialog/#theming
  */
 .ui-dialog {
+       overflow: hidden;
        position: absolute;
        top: 0;
        left: 0;