Each time save is called registerSizeListener will add
new size listeners. If save is called multiple times this causes the
same delta being add/subtracted multiple times, resulting in incorrect
element sizes.
This can be observed in TestMatroska::testRepeatedSave.
Although the test passes, some sizes are incorrect resulting in the
following messages being printed during the test:
TagLib: Failed to read VINT size
TagLib: Failed to parse EMBL ElementID
Signed-off-by: Anthony Brandon <anthony.brandon@gmail.com>
2185b47d5f