template if expression, trailing blanks should be ignored

[nbouthors]

Trailing blank in template if cause the test to fail.
if this.classname=="something" and this.static==false in a polymer element

  <template if='{{(classname!="" )&& (static==true)}} '>   <!-- template appears -->

  <template if='{{(classname!="" )&& (static==true)}}'>   <!-- template does not appears -->

[dfreedm]

Fixed syntax highlighting.

In the future, you should use fenced code blocks so the html code shows up :)

[jmesserly]

hmmm. I'm not entirely sure we want to change behavior here, though @rafaelw is the person to know for sure.

There is a difference between "{{ binding }}" vs having text on either side like "some {{ binding }} text". The former is treated as a data value, and can have a type like boolean. The latter is always a string. Imagine if you wrote false + ' ' in JavaScript. You'd get the string "false ". Same thing happens here. Even if we converted it to boolean, we'd still get true, which you can see from the JavaScript console: if ("false ") console.log("it's true!");

going to close tentatively, but please to let me know if I got that wrong. It definitely happens :)