This change turns quoted match to be case-sensitive (as before),
but not strictly full-string for the whole element's text.
This is a fix for a case where element contains text nodes and child elements:
```html
<div>text1<span>child node</span>text2</div>
```
We now match this div by `text="text1"` and `text="text2"`.
This changes quoted text selector like `text="Foo Bar"` to perform
normalized whitespace match.
Most of the time users want to match some string visible on the page,
and that always means normalized whitespace.
We keep the case sensitivity and full-string vs substring difference
between quoted and unquoted matches.
