[editing] Should the caret move by default, and should we define this behavior? (#58)

Options mentioned so far:

A) Don't move the caret by default and don't define default behavior.

B) Move the caret by default and define the default behavior.

C) Move the caret by default and define some of the default behavior and leave the rest to be decided by UA/platform (for example: let UA decide on line block direction movement, but define inline movement in spec).

D) Move the caret by default, and define all it's default movement in the spec.



This is the default inline movement we initially had in the spec before it was removed:

               <h3>Default caret movement pattern</h3>

                <section>
                    <h4>Caret movement within <a>CE Typing Node</a></h4>

                    <p>Each key press event in the `inline direction` or in the
                    direction opposite to the `inline directions` triggers the
                    movement of the caret of one position within the current
                    <a>CE Typing Node</a>.</p>
                </section>

                <section>
                    <h4>Caret movement at the end of a <a>CE Typing
                    Node</a></h4>If the caret is at the end of a <a>CE Typing
                    Node</a> before the movement takes place, and the requested
                    movement would cause it to go beyond the end of the <a>CE
                    Typing Node</a>, the caret is moved into the start of the
                    next following <a>CE Typing Node</a> that is part of the
                    same <a>CE Typing Container</a>. If this movement did not
                    cause it to move by at least 1px, the caret is moved one
                    additional position.

                    <p></p>

                    <p>If there is no following <a>CE Typing Node</a> to which
                    the caret could be moved, it is not moved.</p>
                </section>

                <section>
                    <h4>Caret movement at the start of a <a>CE Typing
                    Node</a></h4>If the caret is at the start of a <a>CE Typing
                    Node</a> before the movement takes place, and the requested
                    movement would cause it to go beyond the start of the <a>CE
                    Typing Node</a>, the caret is moved into the start of the
                    last preceding <a>CE Typing Node</a> that is part of the
                    same <a>CE Typing Container</a>. If this movement did not
                    cause it to move by at least 1px, the caret is moved one
                    additional position.

                    <p>If there is no previous <a>CE Typing Node</a> to which
                    the caret could be moved, it is not moved.</p>
                </section>
 

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https://github.com/w3c/editing/issues/58