Fix minor text input problem related to dead key previewing.

macOS normally previews a dead key and then replaces the preview by the final text
after the second key is typed.
macOS ≥10.7 also opens an auxiliary window to help choosing among possible characters
after some keys (e.g., n, c, o, a) are pressed and maintained for a while.
The problem fixed here is that after an auxiliary window has been used,
dead keys are no longer previewed.
That problem emerged at some undetermined point before 10.14 and after 10.7.

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