Improve getDOMInsertPointRect #2705
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In order to get rect of the cursor, we have a function
getDOMInsertPointRect(), it uses several different ways to get current rect.However, one of them is to insert a temp SPAN then call getBoundingClientRect() of this SPAN. This causes a DOM tree change and can causes our content model cache to be cleared.
This change is to remove this way, and use a normalized range instead. It shows that for a range inside text node, it can return the rect successfully.