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The gif and mng reader will return -1 as QImageReader::loopCount()
for infinite images. Document that this -1 is clashing with the
error handling of this method.
The documentation was mixing the default and error cases. In some
cases "Otherwise -1" and "Otherwise 0" was used. Change this to
mention the default coming from QImageIOHandler in the "Otherwise"
clause and document the error case with -1.
Add a test case to check that loopCount() returns -1 for infinite
animations.
Reviewed-by: Andreas
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