verify value limits (#2121)

Author: ndonkoHenri

package/lib/src/controls/slider.dart

@@ -93,7 +93,14 @@ class _SliderControlState extends State<SliderControl> {
 
     double value = widget.control.attrDouble("value", 0)!;
     if (_value != value) {
-      _value = value;
+      // verify limits
+      if (value < min) {
+        _value = min;
+      } else if (value > max) {
+        _value = max;
+      } else {
+        _value = value;
+      }
     }
 
     var slider = Slider(

sdk/python/packages/flet-core/src/flet_core/slider.py

@@ -135,7 +135,13 @@ def _get_control_name(self):
     # value
     @property
     def value(self) -> OptionalNumber:
-        return self._get_attr("value", data_type="float")
+        v = self._get_attr("value", data_type="float")
+        # verify limits
+        if v < self.min:
+            v = self.min
+        elif v > self.max:
+            v = self.max
+        return v
 
     @value.setter
     def value(self, value: OptionalNumber):