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Dogecoin-Qt cannot upgrade Qt on a minor release without breaking support for older systems, and thus preventing operators on these to get important security updates. Therefore, it is important to patch the fixed version of Qt we are stuck with when applicable. This backports important bug fixes from later Qt versions that harden Dogecoin-Qt's internals: - Fix possible heap corruption in QXmlStream see: https://codereview.qt-project.org/c/qt/qtbase/+/236691 - do not attempt to load a library relative to $PWD see: https://codereview.qt-project.org/c/qt/qtbase/+/286795 - Fix specific overflow in qtextlayout see: https://codereview.qt-project.org/c/qt/qtbase/+/476125 - QDnsLookup/Unix: Ensure that both the RDATA and the Record header fields before it fall inside the buffer we have see: https://codereview.qt-project.org/c/qt/qtbase/+/477644 - Fix a crash while parsing an XML file with garbage data see: https://codereview.qt-project.org/c/qt/qtbase/+/471756 https://codereview.qt-project.org/c/qt/qtbase/+/455027 - Fix crash when reading corrupt font data see: https://codereview.qt-project.org/c/qt/qtbase/+/503026