Hi DiapDealer,
I have just checked out and built Sigil master and built it on Ubuntu Linux Mint (my VM) using Qt 5.4.0 directly from Qt.
It builds perfectly (nice job with that by the way!) and when I run it I do NOT see any of the doubling of at all!
Could this be an issue on Linux machines that might have an older Qt library installed and that somehow it is finding an earlier Qt 5 version than Qt 5.4? What happens if Linux users use LD_LIBRARY_PATH to force the Sigil executable to use the Qt 5.4. If the Sigil installer puts them someplace in the system, would rerunning ldconfig to clean-up the cache help make sure the Qt 5.4 libs are being found first by Sigil.
Kevin
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