qps fix

Signed-off-by: Benjamin Jakimow <benjamin.jakimow@geo.hu-berlin.de>

eotimeseriesviewer/externals/qps/__init__.py

@@ -30,6 +30,7 @@ import typing
 import warnings
 from qgis.core import QgsApplication, Qgis
 from qgis.gui import QgsMapLayerConfigWidgetFactory
+import qgis.utils
 
 MIN_QGIS_VERSION = '3.14'
 __version__ = '1.0'
@@ -39,7 +40,7 @@ DIR_UI_FILES = DIR_QPS / 'ui'
 DIR_ICONS = DIR_UI_FILES / 'icons'
 QPS_RESOURCE_FILE = DIR_QPS / 'qpsresources_rc.py'
 
-MAPLAYER_CONFIGWIDGET_FACTORIES = list()
+MAPLAYER_CONFIGWIDGET_FACTORIES: typing.List[QgsMapLayerConfigWidgetFactory] = list()
 
 if Qgis.QGIS_VERSION < MIN_QGIS_VERSION:
     warnings.warn(f'Your QGIS ({Qgis.QGIS_VERSION}) is outdated. '
@@ -54,9 +55,11 @@ def registerMapLayerConfigWidgetFactory(factory: QgsMapLayerConfigWidgetFactory)
     :return:
     :rtype:
     """
+    global MAPLAYER_CONFIGWIDGET_FACTORIES
     assert isinstance(factory, QgsMapLayerConfigWidgetFactory)
     if factory not in MAPLAYER_CONFIGWIDGET_FACTORIES:
         MAPLAYER_CONFIGWIDGET_FACTORIES.append(factory)
+        qgis.utils.iface.registerMapLayerConfigWidgetFactory(factory)
 
 
 def unregisterMapLayerConfigWidgetFactory(factory: QgsMapLayerConfigWidgetFactory):
@@ -67,10 +70,11 @@ def unregisterMapLayerConfigWidgetFactory(factory: QgsMapLayerConfigWidgetFactor
     :return:
     :rtype:
     """
+    global MAPLAYER_CONFIGWIDGET_FACTORIES
     assert isinstance(factory, QgsMapLayerConfigWidgetFactory)
     while factory in MAPLAYER_CONFIGWIDGET_FACTORIES:
         MAPLAYER_CONFIGWIDGET_FACTORIES.remove(factory)
-
+        qgis.utils.iface.unregisterMapLayerConfigWidgetFactory(factory)
 
 def mapLayerConfigWidgetFactories() -> typing.List[QgsMapLayerConfigWidgetFactory]:
     """