wxNviz: fix bug in FloatSlider

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@47177 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/gui_modules/nviz_tools.py

@@ -118,6 +118,9 @@ class FloatSlider(wx.Slider):
         Debug.msg(1, "FloatSlider.__init__()")
         wx.Slider.__init__(self, **kwargs)
         self.coef = 1.
+        #init range
+        self.minValueOrig = 0
+        self.maxValueOrig = 1
         
     def SetValue(self, value):
         value *= self.coef