wxGUI: remove initial duplicate point when creating profile or measur…

…ing distance (#2896)

gui/wxpython/mapwin/analysis.py

@@ -70,6 +70,11 @@ def _addPoint(self, x, y):
 
         :param x,y: east north coordinates
         """
+        # avoid duplicating point in the beginning
+        begin = self._mapWindow.mouse["begin"]
+        end = self._mapWindow.mouse["end"]
+        if begin == end:
+            return
         # add new point and calculate distance
         item = self._registeredGraphics.GetItem(0)
         coords = item.GetCoords() + [[x, y]]