Re: [w3c/selection-api] Add beforeselectionchange event (#56)

There would be definite benefit for this event, especially if (along the lines of the detailed `inputType` properties of a `beforeinput` event) this `beforeselectionchange` event could cover OS standardized Edit menu action intents like "Select All" too, not just explicit ranges.

Similarly whatever typical caret movements OS environments standardise for "move caret" or "extend selection" to previous/next glyph/word/paragraph/page/document start/endpoint, and so on, so web developers don't have to guess what raw editing actions their users expect to have such semantics.

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