QFileInfo::canonicalFilePath() returns wrong values when passed trailing slashes

When a QFileInfo object is constructed with a path that points to a file but has trailing slashes exists() returns false, but canonicalFilePath() returns the path with the trailing slashes instead of a empty string.

This can be seen in the attached testcase:
/usr/bin/ls: exists true, canonical "/usr/bin/ls"
/usr/bin/ls/: exists false, canonical "/usr/bin/ls/"
/usr/bin/ls///: exists false, canonical "/usr/bin/ls///"
/usr/bin/doesnotexist: exists false, canonical ""