After "Run", return focus to the query editor

[bart-schaefer]

Tangentially related to #866 ... after highlighting a range and clicking "Run", the focus has left the query editor. A good portion of the time I'd then like to copy the query to paste it elsewhere, but I can't do so without clicking back into the query editor, which (unless I remember to use the right-click menu) clears the selection.

I'd like to be able to press the copy shortcut at this point rather than having to use the mouse. The focus doesn't appear to be anywhere useful (am I wrong?) so moving focus back to the query editor seems an easy solution.

A workaround would be to train myself to use the F5 shortcut so focus never leaves the editor in the first place, but on the other hand that seems to support the idea that clicking Run doesn't need to take the focus out of the editor.