How Do I Remove the Ability to Resize All CKEditor Dialog Windows?

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Since version 3.5 the dialog windows of CKEditor can be resized by using the resizing grip located in the bottom right-hand corner of a dialog window.

The resizing grip of a CKEditor dialog window


You can disable the resizing feature completely by setting the resizable parameter to CKEDITOR.DIALOG_RESIZE_NONE. 

CKEDITOR.on( 'dialogDefinition', function( ev )
{
   ev.data.definition.resizable = CKEDITOR.DIALOG_RESIZE_NONE;
});

Use the CKEDITOR.DIALOG_RESIZE_WIDTH and CKEDITOR.DIALOG_RESIZE_HEIGHT values to enable resizing of a dialog window in one dimension.

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