Qt 4.8.6 provides overall over 200 improvements and bug fixes, for
example:
Security Fix for XML Entity Expansion Denial of Service (the
"Billion Laughs" attack)
Better support for Mac OS X 10.9 Mavericks
Many customer requested bug fixes, for example QTBUG-15116,
QTBUG-21371, QTBUG-8990, QTBUG-28601, QTBUG-20946, QTBUG-30276,
QTBUG-29572 and QTBUG-13237 (just to name a few)
MinGW binary packages are now built with MinGW-w64 based
toolchain with gcc 4.8.2
Basque translation added and many other translations improved
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