Iron Input allows pasting of invalid text after space

[ahrobinson]

Description

Iron-Input element allows pasting of invalid characters if you press spacebar before pasting.

Expected outcome

Iron-input should prevent invalid characters from being pasted.

Actual outcome

Invalid characters are being pasted after pressing spacebar.

Live Demo

https://jsbin.com/jusifovuho/edit?html,output

Steps to reproduce

1. Put a iron-input element in the page.
2. Click inside, press spacebar, paste invalid text.

Browsers Affected

Only tested in Chrome

• [ x] Chrome
• Firefox
• Safari 9
• Safari 8
• Safari 7
• Edge
• IE 11
• IE 10

[ahrobinson]

UPDATE: This bug actually works for any invalid input and not just spaces. If you press an invalid character key, then paste invalid characters, it will allow you to paste the invalid characters. This is due to this._patternAlreadyChecked = true; being ran in _onKeyPress function, because the onInput function will then be called if you paste a value in. Since this._patternAlreadyChecked is true, the pasted value will not be checked against the regex