Only fetch properties if property pane is visible

[gabrimonfa]

Mapguide 2.2 OS: don't care

I've noticed that properties are fetched even if property pane is not visible (disabling it in webLayout XML).

This is important because under certain conditions property fetch takes a lot of time

I've also seen changeset ​4138 and ​4139 made by jng but they do not seem to address properly the case where property pane is disabled from webLayout.

We do have a variable (isProperties) that holds whether property pane is enabled or not.

Thus I propose the following enhancement to the IsPropertyCtrlVisible() function

function IsPropertyCtrlVisible()
{
+    if (!isProperties) return false;
    return GetPropertyCtrl().width > 0;
}

[jng]

Fixed r6198 (trunk) r6199 (2.2). Thanks for the patch