before merge j-dev 20250116

Author: cudmore

src/pymapmanager/interface2/stackWidgets/stackWidget2.py

@@ -100,6 +100,10 @@ def __init__(self,
     def getTimeSeriesCore(self):
         return self._stack.getTimeSeriesCore()
 
+    @property
+    def numSessions(self):
+        return self.getTimeSeriesCore().numSessions
+    
     @property
     def currentSliceNumber(self):
         """Get the current color channel index.