An earlier patch for this bug (changeset 466d3ff030e6) removed local variable
"nsRect area", but then ended up effectively re-creating it further down in the
function as "contentBoxRect". (I added contentBoxRect as a late-breaking
change, as part of addressing a review comment.)
I've now realized that contentBoxRect is the same rect as "area", and it's
simpler to just declare the original "area" rect at the function's start
instead of dynamically creating it further down.
(Not requesting review, since this is a no-functional-change tweak, which is
following up on a change that I'd made in response to review feedback on a r+'d
patch.)
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