fix(view): handle boolean attribute followed by non space whitespace or self-closing tags

[wryk]

I encountered compilation issues with else control structure :

<textarea :if="true"></textarea><input :else/>

<textarea :if="true"></textarea><div :else
></div>

// Both throws a ViewCompilationFailed exception with syntax error, unexpected token "??"

While debugging this I found that the lexer consumes more characters than expected in the ATTRIBUTE_NAME token when handling boolean attributes followed by a self-closing tag or a non space whitespace.

My fix is correct HTML-wise as far I as know but I've never worked on a lexer before and may not have thought about a possible regression.

One existing test failed, but the expected case was inconsistent with the others attributes. I updated it and all other view tests passed.

[brendt]

Thanks! The failing action seems to be unrelated to your PR, I'll merge and take a look at the error myself.