fixed dropdown dest rect and auto-placing sibling items

Author: RonenNess

GeonBit.UI/GeonBit.UI/Entities/Dropdown.cs

@@ -225,6 +225,17 @@ override protected void DoOnValueChange()
             base.DoOnValueChange();
         }
 
+        /// <summary>
+        /// Return the actual dest rect for auto-anchoring purposes.
+        /// This is useful for things like DropDown, that when opened they take a larger part of the screen, but we don't
+        /// want it to push down other entities.
+        /// </summary>
+        override protected Rectangle GetDestRectForAutoAnchors()
+        {
+            _selectedTextPanel.UpdateDestinationRectsIfDirty();
+            return _selectedTextPanel.GetActualDestRect();
+        }
+
         /// <summary>
         /// Get actual destination rect for positioning, which is the size of the DropDown entity when list is closed.
         /// </summary>

GeonBit.UI/GeonBit.UI/Entities/Entity.cs

@@ -1330,7 +1330,7 @@ virtual public Rectangle CalcDestRect()
                         }
 
                         // align y
-                        ret.Y = prevEntity.GetActualDestRect().Bottom + (int)(offset.Y +
+                        ret.Y = prevEntity.GetDestRectForAutoAnchors().Bottom + (int)(offset.Y +
                             prevEntity._scaledSpaceAfter.Y +
                             _scaledSpaceBefore.Y);
                     }
@@ -1376,6 +1376,16 @@ virtual public Rectangle GetActualDestRect()
             return _destRect;
         }
 
+        /// <summary>
+        /// Return the actual dest rect for auto-anchoring purposes.
+        /// This is useful for things like DropDown, that when opened they take a larger part of the screen, but we don't
+        /// want it to push down other entities.
+        /// </summary>
+        virtual protected Rectangle GetDestRectForAutoAnchors()
+        {
+            return GetActualDestRect();
+        }
+
         /// <summary>
         /// Remove this entity from its parent.
         /// </summary>