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JSON: When clearing duplicate object entries, also clear containers

Andreas Sturmlechner requested to merge asturmlechner/qtbase:QTBUG-99799 into kde/5.15

Previously, if you had multiple entries with the same name in an object, and some of them were again objects or arrays, parsing the JSON document would leak memory.

Also, we use std::stable_sort instead of std::sort now, so that we don't accidentally randomize the order of elements with equal keys.

[ChangeLog][QtCore][JSON] A memory leak in the JSON parser when reading objects with duplicate keys was fixed.

Pick-to: 5.15 6.2 6.3 Fixes: QTBUG-99799 Change-Id: Ic2065f2e490c2d3506a356745542148ad9c24262 Reviewed-by: Thiago Macieira thiago.macieira@intel.com (cherry picked from commit 1b4a5ecc)

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