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RevBy: Kavindra

Task:     180315
RevBy:
Details:

workaround for getting the ShortcutOverride twice

Details:  re-use lineForPosition

this has several advantages compared to an undo/redo stack private to fakevim:
- change marks in document correspond to actual changes
- mouse pasting does not invalidate the fakevim undo/redo stack
- menu commands (such as undo/redo from the Edit menu) do not invalidate the fakevim undo/redo stack
- possible other changes not caused by fakevim do not invalidate fakevim undo/redo stack

it is pretty bad if the fakevim undo/redo stack becomes invalid, as applying these invalid
undo/redo operations corrupts the document

   implement ^ and 0

    Details:  patch suggested by Bart van Deenen

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