Dialog: Fixed logic for mimicking minHeight. Fixes #6150 - Dialog hei…

…ght:auto does not work in IE6.

ui/jquery.ui.dialog.js

@@ -629,11 +629,11 @@ $.widget("ui.dialog", {
 		 * divs will both have width and height set, so we need to reset them
 		 */
 		var options = this.options,
-			nonContentHeight;
+			nonContentHeight,
+			minContentHeight;
 
 		// reset content sizing
-		// hide for non content measurement because height: 0 doesn't work in IE quirks mode (see #4350)
-		this.element.css({
+		this.element.show().css({
 			width: 'auto',
 			minHeight: 0,
 			height: 0
@@ -650,17 +650,24 @@ $.widget("ui.dialog", {
 				width: options.width
 			})
 			.height();
-
-		this.element
-			.css(options.height === 'auto' ? {
-					minHeight: Math.max(options.minHeight - nonContentHeight, 0),
-					height: $.support.minHeight ? 'auto' :
-						Math.max(options.minHeight - nonContentHeight, 0)
-				} : {
-					minHeight: 0,
-					height: Math.max(options.height - nonContentHeight, 0)				
-			})
-			.show();
+		minContentHeight = Math.max( 0, options.minHeight - nonContentHeight );
+
+		if ( options.height === "auto" ) {
+			// only needed for IE6 support
+			if ( $.support.minHeight ) {
+				this.element.css({
+					minHeight: minContentHeight,
+					height: "auto"
+				});
+			} else {
+				this.uiDialog.show();
+				var autoHeight = this.element.css( "height", "auto" ).height();
+				this.uiDialog.hide();
+				this.element.height( Math.max( autoHeight, minContentHeight ) );
+			}
+		} else {
+			this.element.height( Math.max( options.height - nonContentHeight, 0 ) );
+		}
 
 		if (this.uiDialog.is(':data(resizable)')) {
 			this.uiDialog.resizable('option', 'minHeight', this._minHeight());