I'm tinkering with writing .ico files and tried to visualise the result on 
Linux, which gave me an error message:

%> gwenview5 test.ico
QImageReader::read() using format hint "ico" failed: "Unknown error"
A bad Qt image decoder moved the buffer to 22 in a call to canRead()! Rewinding.
Image format is actually "ico" not "ico"

This is with Qt 5.7.1 , and it happens with ico files created by QtIcoHandler 
itself, and with the 3rd party icotool utility. The number of icons in the file 
makes no difference.

Is this a bug?

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