I think the line:
mod.binaries.extend(qt5_plugins_binaries('printsupport'))
is needed in PyInstaller/hooks/hook-PyQt5.QtGui.py
Since Qt5, platform specific printer code is in a plugin, found in a
directory parallel to other plugins like 'imageformats' plugins. (This is
changed from Qt4.)
Symptoms of this omission: when a printer is needed to show e.g. a print
dialog, it returns an error something like 'QPrintDialog cannot be used
with non-native printer.' Which I think really means the plugin could not
be found.
I tested this on the OSX platform (hacking the latest PyInstaller *947),
and it seems to work. I could be wrong.
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