From c4b5abd7b5cbb1dabaf64cb813cc951c838a9b4f Mon Sep 17 00:00:00 2001
From: goat <16760685+goaaats@users.noreply.github.com>
Date: Mon, 12 Apr 2021 02:55:36 +0200
Subject: [PATCH] feat: implement CheckViewportState() in InterfaceManager

---
 Dalamud/Interface/InterfaceManager.cs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Dalamud/Interface/InterfaceManager.cs b/Dalamud/Interface/InterfaceManager.cs
index b4a1c436a..c3b3ea770 100644
--- a/Dalamud/Interface/InterfaceManager.cs
+++ b/Dalamud/Interface/InterfaceManager.cs
@@ -282,11 +282,25 @@ namespace Dalamud.Interface
             // Process information needed by ImGuiHelpers each frame.
             ImGuiHelpers.NewFrame();
 
+            // Check if we can still enable viewports without any issues.
+            this.CheckViewportState();
+
             this.scene.Render();
 
             return this.presentHook.Original(swapChain, syncInterval, presentFlags);
         }
 
+        private void CheckViewportState()
+        {
+            if (this.dalamud.Configuration.IsNeverViewport || this.scene.SwapChain.IsFullScreen || ImGui.GetPlatformIO().Monitors.Size == 1)
+            {
+                ImGui.GetIO().ConfigFlags &= ~ImGuiConfigFlags.ViewportsEnable;
+                return;
+            }
+
+            ImGui.GetIO().ConfigFlags |= ImGuiConfigFlags.DockingEnable;
+        }
+
         public static ImFontPtr DefaultFont { get; private set; }
         public static ImFontPtr IconFont { get; private set; }