[4.2.0.179] Resized window does not properly shrinkWrap a collapsible panel

[wsi]

REQUIRED INFORMATION
Ext version tested:

• Ext 4.2.0.179

Browser:

• Chrome 24.0.1312.57 m

Description:

• When a panel is collapsed, the window containing it shrinks to fit the collapsed panel. After resizing the window, it no longer shrinkwraps its contents.

Steps to reproduce the problem:

• Create a collapsible panel.
• Create a window which contains the collapsible panel.
• Resize the window.
• Collapse the panel.

The result that was expected:

• The window should shrinkwrap the panel.

The result that occurs instead:

• The window remains the same size.

Test Case:

var panel = Ext.create('Ext.panel.Panel', {
    collapsible: true,
    width: 200,
    height: 200
});


var window = Ext.create( 'Ext.window.Window', {
    layout: "fit",
    renderTo: Ext.getBody()
});


window.add( panel );
window.show();

Workaround:

Put listeners on the collapse and expand and resize the window explicitly.

var panel = Ext.create('Ext.panel.Panel', {
    collapsible: true,
    width: 200,
    height: 200
});

var window = Ext.create( 'Ext.window.Window', {
    layout: "fit",
    renderTo: Ext.getBody()
});

window.add( panel );
window.show();

panel.on( 'collapse', function() {
      window.setHeight( 56 );
});


panel.on( 'expand', function() {
      window.setHeight( 200 );
});

However, this lead to another bug if animCollapse is set to false for the panel. The window.setHeight call would cause a javascript error in this case:
Uncaught TypeError: Cannot read property 'length' of undefined

[evant]

This is the expected behaviour. By resizing the window, you're giving it explicit dimensions, which means it will no longer wrap around the contents.