[4.2.0 GA] Invalid checkbox disappears

[cabal]

REQUIRED INFORMATION
Ext version tested:

• Ext 4.2.0 GA
• Ext 4.2.1.760

Browser versions tested against:

• FF20

DOCTYPE tested against:

• HTML 4.01 Transitional

Description:

• When checkbox (input type=button with background) is in invalid state (for example: markInvalid), it disappears.

Steps to reproduce the problem:

• create checkbox
• make it invalid

The result that was expected:

• exclamation sign on left, checkbox visible

The result that occurs instead:

• error mark is ok, but checkbox changes background image and it is not visible
• in neptune theme it's ok

Test Case:
Add following item to dynamic form example

{
     fieldLabel: 'Checkbox',
     listeners: {
         render: function(box) {
             box.markInvalid('Checkbox is hidden');
         }
     },
     xtype: 'checkbox'
}

Possible fix:

The reason is input.x-form-invalid-field css class that changes the background image.

• check the difference in neptune and apply it to classic and apply it OR
• mark x-form-checkbox background as important (dirty) OR
• change default invalidCls for checkbox (as I did)

Additional CSS used:

• only default ext-all-gray.css

[slemmon]

Thanks for the report! I have opened a bug in our bug tracker.