Fix DropdownControl: auto-select first item in constructor, prevent reopen on header click dismiss

Author: nickprotop

SharpConsoleUI.Tests/Controls/DropdownControlTests.cs

@@ -782,7 +782,7 @@ public void Color_Properties_HaveDefaults()
 		var ffg = dd.FocusedForegroundColor;
 		var hbg = dd.HighlightBackgroundColor;
 		var hfg = dd.HighlightForegroundColor;
-		Assert.NotEqual(default, bg);
+		Assert.Equal(Color.Black, bg);
 	}
 
 	[Fact]

SharpConsoleUI/Controls/DropdownControl/DropdownControl.Mouse.cs

@@ -92,6 +92,20 @@ public bool ProcessMouseEvent(MouseEventArgs args)
 			{
 				if (isOnHeader)
 				{
+					// If the dropdown was just dismissed by an outside-click on this
+					// same mouse-down, suppress so the release doesn't reopen it.
+					if (_dismissedByOutsideClick)
+					{
+						_dismissedByOutsideClick = false;
+						_isHeaderPressed = false;
+
+						if (!_hasFocus)
+							SetFocus(true, FocusReason.Mouse);
+
+						Container?.Invalidate(true);
+						return true;
+					}
+
 					_isHeaderPressed = true;
 
 					// Capture focus on mouse down

SharpConsoleUI/Controls/DropdownControl/DropdownControl.Portal.cs

@@ -36,7 +36,11 @@ private void OpenDropdown()
 			{
 				_portalContent = new DropdownPortalContent(this);
 				_portalContent.DismissOnOutsideClick = true;
-				_portalContent.DismissRequested += (s, e) => CloseDropdown();
+				_portalContent.DismissRequested += (s, e) =>
+				{
+					_dismissedByOutsideClick = true;
+					CloseDropdown();
+				};
 				_dropdownPortal = window.CreatePortal(this, _portalContent);
 			}
 

SharpConsoleUI/Controls/DropdownControl/DropdownControl.cs

@@ -55,6 +55,7 @@ public partial class DropdownControl : BaseControl, IInteractiveControl, IFocusa
 		// Mouse state tracking
 		private bool _isHeaderPressed;
 		private int _mouseHoveredIndex = -1;
+		private bool _dismissedByOutsideClick;
 
 		// Portal state for dropdown overlay
 		private LayoutNode? _dropdownPortal;
@@ -92,6 +93,11 @@ public DropdownControl(string prompt = "Select an item:", IEnumerable<string>? i
 				{
 					_items.Add(new DropdownItem(item));
 				}
+				if (_items.Count > 0)
+				{
+					_selectedIndex = 0;
+					_highlightedIndex = 0;
+				}
 			}
 		}
 
@@ -106,6 +112,11 @@ public DropdownControl(string prompt, IEnumerable<DropdownItem>? items = null)
 			if (items != null)
 			{
 				_items.AddRange(items);
+				if (_items.Count > 0)
+				{
+					_selectedIndex = 0;
+					_highlightedIndex = 0;
+				}
 			}
 		}