During the implementation of QString::append(QUtf8StringView) it has
become apparent that the testing is insufficient as it did not warn
about an extra growth. The following tests have been added that append:
- y-umlaut and greek letter small theta (2 UTF-8 code units => 1 UTF-16)
- devanagri letter ssa (3 UTF-8 code units => 1 UTF-16)
- chakma digit zero (4 UTF-8 code units => 2 UTF-16 code units)
- some combinations of the above
Pick-to: 6.4 6.2
Task-number: QTBUG-103302
Change-Id: I981213c296bafc81663b08c0f1f339bbd8a96485
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
8c0ed7422c