feat(window): wire move/resize flags and consolidate the duplicate toggle

HellionChat/Ui/Windows/MainWindow.cs

@@ -66,9 +66,6 @@ internal sealed class MainWindow : Window
             MinimumSize = new Vector2(MinWidth, MinHeight),
             MaximumSize = new Vector2(float.MaxValue, float.MaxValue),
         };
-        // The message list owns its own scroll inside the body child;
-        // the outer window must not show a second scrollbar.
-        Flags = ImGuiWindowFlags.NoScrollbar | ImGuiWindowFlags.NoScrollWithMouse;
         IsOpen = Plugin.Config.MainWindowOpen;
         RespectCloseHotkey = false;
     }
@@ -80,6 +77,22 @@ internal sealed class MainWindow : Window
     internal float ResolveBgAlpha(bool isFocused) =>
         isFocused ? Plugin.Config.WindowOpacity : Plugin.Config.WindowOpacityInactive;
 
+    // B1-2: rebuild flags from a fresh base every frame so toggling CanMove/
+    // CanResize back on actually CLEARS NoMove/NoResize (not accumulating).
+    // Move/resize toggle logic as 1.5.6 (ChatLogWindow.PreOpenCheck
+    // 1d3b429:703-707); base flags = today's MainWindow set (NoScrollbar|
+    // NoScrollWithMouse — the message list owns its own scroll; 1.5.6's
+    // NoFocusOnAppearing/NoTitleBar are deliberately not restored).
+    internal static ImGuiWindowFlags ResolveFlags(bool canMove, bool canResize)
+    {
+        var flags = ImGuiWindowFlags.NoScrollbar | ImGuiWindowFlags.NoScrollWithMouse;
+        if (!canMove)
+            flags |= ImGuiWindowFlags.NoMove;
+        if (!canResize)
+            flags |= ImGuiWindowFlags.NoResize;
+        return flags;
+    }
+
     public override void PreDraw()
     {
         // Dalamud's WindowHost turns Window.BgAlpha into SetNextWindowBgAlpha
@@ -100,6 +113,8 @@ internal sealed class MainWindow : Window
             else
                 BgAlpha = null;
         }
+
+        Flags = ResolveFlags(Plugin.Config.CanMove, Plugin.Config.CanResize);
     }
 
     public Tab? ActiveTab => _activeTab;