Introduce a temporary variable, `other_para`, so that we don't end up returning incorrect para (with stale run) inside the output cursor.
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=54564
-- v2: riched20: Don't set para unless committing cursor move in ME_MoveCursorWords. riched20/tests: Test for word movement across paragraph boundary.