The page is scrolled to the bottom when switching to Source while editing in-place

You can reproduce this simply by:

• editing the Sandbox home page
• (optional) select the first word (this is just to see that the selection is preserved)
• switch to Source => the page is scroll to the bottom (even if the selection is preserved)

Note that the selection is properly restored, it's just that the page is not scrolled to make the selection visible.