Selector: Backport jQuery selection context logic to selector-native

This makes:
```js
$div.find("div > *")
```
no longer matching children of `$div`.

Also, leading combinators now work, e.g.:
```js
$div.find( "> *" );
```
returns children of `$div`.

As a result of that, a number of tests are no longer skipped in the
`selector-native` mode.

Also, rename `rcombinators` to `rleadingCombinator`.

Fixes gh-5185
Closes gh-5186
Ref gh-5085

1 files changed, 11 insertions, 0 deletions

diff --git a/src/selector/toSelector.js b/src/selector/toSelector.js
new file mode 100644
index 000000000..bd0c15f69
--- /dev/null
+++ b/src/selector/toSelector.js
@@ -0,0 +1,11 @@
+function toSelector( tokens ) {
+	var i = 0,
+		len = tokens.length,
+		selector = "";
+	for ( ; i < len; i++ ) {
+		selector += tokens[ i ].value;
+	}
+	return selector;
+}
+
+export default toSelector;