My guess is that few people will be affected, and those that are can easily 
upgrade.  For example, my installed version of pyqt is 4.7 on Windows and 
4.8.6 on Ubuntu.  (It's 5.3.0 on Windows with Python 3.4).

Please speak up *immediately* if you have any objections with this proposal.

Requiring "modern" (>=4.5) versions of pyqt would allow new-style 
connections of events.  This would simplify the code by replacing code such 
as::

    if isQt5:
        action.triggered.connect(func)
    else:
        action.connect(act, Qt.SIGNAL('triggered()'),func)

by just:

    action.triggered.connect(func)

Code such as this appears in *many* places in Leo's core.  You could say 
that such code should also appear in plugins, but several plugins *already* 
use new-style connections, which is another reason to suppose that few 
people will object.

Speak now or live with the consequences.

Edward

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