The 'Position and Size' dialog has 2 checkboxes under the heading 'Protect' - position and size - which lock the size or position of an object, and i think is useful to have this in the context menu. This suggestion was primarily targetted as impress and draw, but calc and writer may also benefit from this as well.
A third item that should be included is aspect ratio, which in the dialog is labeled 'keep ratio'.
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