They shouldn't exist in the first place. They exist in two cases only:
1) mistake by the user in the QLibrary or QPluginLoader constructors or
setFileName
2) as a kludge for setLoadHints before a file name is set (we need to
store the user's requested hints somewhere)
This is important for the second case, as otherwise all QLibrary and
QPluginLoader objects without a file name would share the setting.
Task-number: QTBUG-39642
Change-Id: Iebff0252fd4d95a1d54caf338d4e2fff4de3b189
Reviewed-by: David Faure <david.faure@kdab.com>
f07c27eec1