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Originally reported in issue 38871. See that issue for the screenshot of the Watch window. The table headings are still a bit off (spacing is strange) You can look at the Debugger implementation to see an example of a table that has cells that are editable, along with headers that are moveable. (Window | Debugging -> Watches, right click in that window to get the "New Watch..." context menu and add a few watches)
Compare with other feature to see if same approach can be used.
I'l try to fix that for promo D.
*** This issue has been marked as a duplicate of 39288 ***