Dialog: Use .height(0) instead of .hide(0) when determining the size …

…of the non-content area of a dialog.

Partial fix for #5392 - Dialog explicit height doesn't match given value from set option.

ui/jquery.ui.dialog.js

@@ -623,7 +623,7 @@ $.widget("ui.dialog", {
 		// reset content sizing
 		// hide for non content measurement because height: 0 doesn't work in IE quirks mode (see #4350)
 		this.element.css('width', 'auto')
-			.hide();
+			.height(0);
 
 		// reset wrapper sizing
 		// determine the height of all the non-content elements