DropDown size remains reduced after filtering when IsEditable and IsFilteringEnabled are active Validated

Description:

When both IsEditable and IsFilteingEnabled are enabled, the DropDown's height becomes incorrect after performing a filtered search. Once a selection is made and the user clicks the selection again deleting one character, the DropDown reopens with the reduced height from the filtered list. But after clicking the DropDown icon to show the full  list, the DropDown remains at the smaller (filtered) height instead of expanding to display all available items.

Steps to Reproduce:

1. Set IsEditable  true and IsFilteringEnabled  true on the ComboBox Control.
   
2. Open the DropDown - the full list is displayed correctly.
3. Select an item.
4. Click into the editable field.
5. Delete one character to trigger the filtered DropDown.
6. Reselect the item from the filtered list.
   
7. Click the DropDown icon to expand and view the full list

(the DropDown now opens with incorrect, reduced height from the previously filtered state)

Expected Behavior:
After clicking the DropDown icon, the full list should be shown, and the DropDown should return to its normal size.

Actual Behavior:
The DropDown remains the same (reduced) height as the prevoiusly filtered list, even though the full list should be visible.