Remove plugin module path when unloading

    Unloading plugin must remove added module path
    in order to prevent wrong package import when reloading

Author: dmarteau

python/utils.py

@@ -28,7 +28,7 @@
 
 """
 
-from qgis.PyQt.QtCore import QCoreApplication, QLocale, QThread
+from qgis.PyQt.QtCore import QCoreApplication, QLocale, QThread, qDebug
 from qgis.PyQt.QtWidgets import QPushButton, QApplication
 from qgis.core import Qgis, QgsMessageLog, qgsfunction, QgsMessageOutput
 from qgis.gui import QgsMessageBar
@@ -411,12 +411,23 @@ def _unloadPluginModules(packageName):
             if hasattr(sys.modules[mod], 'qCleanupResources'):
                 sys.modules[mod].qCleanupResources()
         except:
-            pass
+            # Print stack trace for debug
+            qDebug("qCleanupResources error:\n%s" % traceback.format_exc())
+
+        # try removing path
+        if hasattr(sys.modules[mod], '__path__'):
+            for path in sys.modules[mod].__path__:
+                try:
+                    sys.path.remove(path)
+                except ValueError:
+                    # Discard if path is not there
+                    pass
+
         # try to remove the module from python
         try:
             del sys.modules[mod]
         except:
-            pass
+            qDebug("Error when removing module:\n%s" % traceback.format_exc())
     # remove the plugin entry
     del _plugin_modules[packageName]