collapse bottom panel

src/SharpIDE.Godot/Features/BottomPanel/BottomPanelManager.cs

@@ -31,7 +31,11 @@ public partial class BottomPanelManager : Panel
         {
             if (type == null)
             {
-                // TODO: Ask parent to to collapse slider.
+                GodotGlobalEvents.InvokeBottomPanelVisibilityChangeRequested(false);
+            }
+            else
+            {
+                GodotGlobalEvents.InvokeBottomPanelVisibilityChangeRequested(true);
             }
             foreach (var kvp in _panelTypeMap)
             {

src/SharpIDE.Godot/Features/CustomControls/InvertedVSplitContainer.cs

@@ -7,6 +7,23 @@ public partial class InvertedVSplitContainer : VSplitContainer
 {
     [Export]
     private int _invertedOffset = 200;
+    private bool _invertedCollapsed = false;
+
+    public void InvertedSetCollapsed(bool collapsed)
+    {
+        if (_invertedCollapsed == collapsed) return;
+        _invertedCollapsed = collapsed;
+        if (collapsed)
+        {
+            SplitOffset = (int)Size.Y + 100;
+            DraggingEnabled = false;
+        }
+        else
+        {
+            SplitOffset = (int)Size.Y - _invertedOffset;
+            DraggingEnabled = true;
+        }
+    }
 
     public override void _Ready()
     {