[qt] Conflict with ipython loading pyqt4 and silx loading pyqt5
From ipython, when there is both pyqt4 and pyqt5, it happens that %gui qt loads pyqt4 but silx.gui.qt try to load pyqt5...
diff --git a/silx/gui/qt.py b/silx/gui/qt.py
index 370b1af0d..0664dff37 100644
--- a/silx/gui/qt.py
+++ b/silx/gui/qt.py
@@ -72,13 +72,13 @@ HAS_SVG = False
 """True if Qt provides support for Scalable Vector Graphics (QtSVG)."""
 
 # First check for an already loaded wrapper
-if 'PySide' in sys.modules:
+if 'PySide.QtCore' in sys.modules:
     BINDING = 'PySide'
 
-elif 'PyQt5' in sys.modules:
+elif 'PyQt5.QtCore' in sys.modules:
     BINDING = 'PyQt5'
 
-elif 'PyQt4' in sys.modules:
+elif 'PyQt4.QtCore' in sys.modules:
     BINDING = 'PyQt4'
 
 else:  # Then try Qt bindings
['silx/gui/qt.py']