Dialog + themeroller breaks in IE6 due to negative minHeight

[cjwilks]

Description courtesy Goonoo Kim. References:

•  http://groups.google.com/group/jquery-ui/browse_thread/thread/ea5e64ff8b073e2c
•  http://groups.google.com/group/jquery-ui/browse_thread/thread/d89e7ddf5310ab41

Using JQuery UI 1.6rc5 and jQuery 1.3: The following example doesn't work in IE6.

<!-- height of content is over than 150 -->
<div id="dialog">
 <p>blah blah</p>
<p>blah blah</p>
<p>blah blah</p>
<p>blah blah</p>
<p>blah blah</p>
<p>blah blah</p>
<p>blah blah</p>
<p>blah blah</p>
<p>blah blah</p>
</div>

<script type="text/javascript">
$("#dialog").dialog({minHeight: 150}); // minHeight as default
</script>

In above case, 454 Line of jQuery UI Dialog 1.6rc5 got error on IE6.

this.element
    .css({
        //***IE breaks when this is a negative number***//
        minHeight: options.minHeight - nonContentHeight, 
        height: options.height == 'auto'
            ? 'auto'
            : options.height - nonContentHeight
    }); 

[cjwilks]

The workaround for now is to manually set minHeight to something large enough...

$("...").dialog({ minHeight: 500 });

[dndrnkrd]

Just commented on this in #3930 as well; recommend that

minHeight: options.minHeight - nonContentHeight,

be changed to

minHeight: Math.max(options.minHeight - nonContentHeight,0),

to keep minHeight non-negative

[scott.gonzalez]

Fixed in r1845. Thanks.