[w3c/editing] It might help to write clearer code, if EditContext would have some attributes (Issue #378)

* `selectionIsCollapsed` (`true` if `selectionStart == selectionEnd`)
* `selectionLength` (the value of `selectionEnd - selectionStart`)
* `compositionRangeIsCollapsed` (`true` if `compositionRangeStart == compositionRangeEnd`)
* `compositionRangeLenth` (the value of `compositionRangeEnd - compositionRangeStart`)

Not strong opinion, I just wondered.

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