minimal fix for mouseup --> focus logic on IE10, IE11, fixes #17970

(cherry picked from commit 3ae93b6ecd641e4cc9d4c8368f33c9ac35f5c764)
fix another test typo, refs #11132

(cherry picked from commit 2ed43ef0a195d7dd7e3873797f5987e9f4d226b9)