[DEFER-1223] Nested layouts don't render inner layout if not initially visible

[marc.spoor]

A panel with border layout contains a panel with form layout which contains a panel with vbox layout which contains a button.
The border layout panel is configured such that the form layout panel is initially collapsed.
Therefore, the button will not be rendered.
If the panel with form layout is initially expanded everything works fine.

This has been seen in 3.2.1.
The JSON was generated with Ext Designer.

{
    xtype: 'viewport',
    width: 406,
    layout: 'border',
    items: [
        {
            xtype: 'panel',
            region: 'north',
            layout: 'form',
            height: 55,
            collapsed: true, // <-- set it to false and it works
            items: [
                {
                    xtype: 'panel',
                    layout: 'vbox',
                    height: 50,
                    items: [
                        {
                            xtype: 'button',
                            text: 'cannot be seen',
                            flex: 1
                        }
                    ]
                }
            ]
        },
        {
            xtype: 'panel',
            region: 'center'
        }
    ]
}

I have found two previous forum entries/bug reports that may or may not refer to that same issue:

• http://www.sencha.com/forum/showthre...nested+layouts
  
• http://www.sencha.com/forum/showthread.php?71675-Accordion-layouts-should-offer-deferredRender-option&highlight=nested+layouts

I was hoping a slight modification of the API documentation page would reproduce that same effect, but that page uses existing markup and "converts" it to Ext controls. Unfortunately, this is not possible in my case.

Cheers,

-Marc

[Jamie Avins]

This is a current limitation that we are addressing in the next release.

[marc.spoor]

Okay, thanks for your reply.
I'll keep my eyes peeled.

[marc.spoor]

I just tested it with ext-3.3.0, and the problem still occurs.

EDIT: The problem occurs in Chrome, but not in IE8.