[core] fix(ResizeSensor): ResizeObserver feature detection #6468
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Fixes https://github.com/palantir/blueprint/pull/6458/files#r1360920703
Changes proposed in this pull request:
Fixes a regression caused by #6458 where we stopped feature checking for the existence of
ResizeObserver
. It turns out that this broke usage in jsdom testing environments, so we need to add back the check.Reviewers should focus on:
No regressions in Popover resize behavior & ResizeSensor tests
Screenshot
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