Path: Fix bug with inaccurate Task Panel values upon new op creation

Path: Fix bug with inaccurate Task Panel values upon new op creation

src/Mod/Path/PathScripts/PathGui.py

@@ -100,6 +100,7 @@ class QuantitySpinBox:
         self.widget = widget
         self.onBeforeChange = onBeforeChange
         self.prop = None
+        self.obj = obj
         self.attachTo(obj, prop)
 
     def attachTo(self, obj, prop = None):
@@ -139,9 +140,14 @@ class QuantitySpinBox:
         If no value is provided the value of the bound property is used.
         quantity can be of type Quantity or Float.'''
         PathLog.track(self.prop, self.valid)
+
         if self.valid:
+            expr  = self._hasExpression()
             if quantity is None:
-                quantity = PathUtil.getProperty(self.obj, self.prop)
+                if expr:
+                    quantity = FreeCAD.Units.Quantity(self.obj.evalExpression(expr))
+                else:
+                    quantity = PathUtil.getProperty(self.obj, self.prop)
             value = quantity.Value if hasattr(quantity, 'Value') else quantity
             self.widget.setProperty('rawValue', value)
 
@@ -151,3 +157,9 @@ class QuantitySpinBox:
         if self.valid:
             return updateInputField(self.obj, self.prop, self.widget, self.onBeforeChange)
         return None
+
+    def _hasExpression(self):
+        for (prop, exp) in self.obj.ExpressionEngine:
+            if prop == self.prop:
+                return exp
+        return None

src/Mod/Path/PathScripts/PathOpGui.py

@@ -1203,7 +1203,18 @@ class TaskPanel(object):
                     page.clearBase()
                     page.addBaseGeometry(sel)
 
+        # Update properties based upon expressions in case expression value has changed
+        for (prp, expr) in self.obj.ExpressionEngine:
+            val = FreeCAD.Units.Quantity(self.obj.evalExpression(expr))
+            value = val.Value if hasattr(val, 'Value') else val
+            prop = getattr(self.obj, prp)
+            if hasattr(prop, "Value"):
+                prop.Value = value
+            else:
+                prop = value
+
         self.panelSetFields()
+
         for page in self.featurePages:
             page.pageRegisterSignalHandlers()