feat: add SetWindowPosRelativeMainViewport to ImGuiHelpers

Dalamud/Interface/ImGuiHelpers.cs

@@ -37,10 +37,26 @@ namespace Dalamud.Interface
         public static void ScaledRelativeSameLine(float offset, float spacing = -1.0f) =>
             ImGui.SameLine(ImGui.GetCursorPosX() + (offset * GlobalScale));
 
+        /// <summary>
+        /// Set the position of the next window relative to the main viewport.
+        /// </summary>
+        /// <param name="position">The position of the next window.</param>
+        /// <param name="condition">When to set the position.</param>
+        /// <param name="pivot">The pivot to set the position around.</param>
         public static void SetNextWindowPosRelativeMainViewport(
             Vector2 position, ImGuiCond condition = ImGuiCond.None, Vector2 pivot = default)
             => ImGui.SetNextWindowPos(position + MainViewport.Pos, condition, pivot);
 
+        /// <summary>
+        /// Set the position of a window relative to the main viewport.
+        /// </summary>
+        /// <param name="name">The name/ID of the window.</param>
+        /// <param name="position">The position of the window.</param>
+        /// <param name="condition">When to set the position.</param>
+        public static void SetWindowPosRelativeMainViewport(
+            string name, Vector2 position, ImGuiCond condition = ImGuiCond.None)
+            => ImGui.SetWindowPos(position + MainViewport.Pos, condition);
+
         /// <summary>
         /// Get data needed for each new frame.
         /// </summary>