Copy Paste Handler Issue

[elliotcondon]

Describe the bug
Copying & pasting from a <input type="text" /> element produces different results to a <input type="email" /> element.

The value copied from an email input (and also a number input) contains the full block HTML, not the input's value. Issue is demonstrated in the following screen recording.

To Reproduce
Steps to reproduce the behavior:

1. Add the following JS to register the block
2. Enter values into both the text and email inputs
3. Copy and paste the values into the provided textarea
4. See error

	var el = wp.element.createElement,
    	registerBlockType = wp.blocks.registerBlockType;
	
	registerBlockType( 'test/test-copy-paste', {
	    title: 'Test Copy & Paste',
	    icon: 'universal-access-alt',
	    category: 'layout',
	    edit: function( props ) {
	        return el(
	            'div',
	            {
	                className: 'test',
	            },
	            el(
		            'input',
		            {
		               	type: 'text',
		                placeholder: 'text',
		                style: { width: '45%' }
		            }
		        ),
	            el(
		            'input',
		            {
		                type: 'email',
		                placeholder: 'email',
		                style: { width: '45%' }
		            }
		        ),
		        el(
		            'textarea',
		            {
		                placeholder: 'textarea',
		                style: { width: '100%' }
		            }
		        ),
	        );
	    },
	    save: function( props ) {
	        return el(
	            'p',
	            {},
	            'This is a test.'
	        );
	    }
	});

Expected behavior
The value copied from any input/textarea should match the behavior of the "text" input.

Additional context

• WordPress 5.0

[grappler]

This is still an issue with WP 5.4. This #21162 should fix this issue.