From 605a16d95cc22718de1ece90905f70c977de04eb Mon Sep 17 00:00:00 2001
From: Laszlo Nemeth <57342539+donlaci@users.noreply.github.com>
Date: Wed, 25 Sep 2024 13:38:57 +0200
Subject: [PATCH] [Workspaces] add monitor detection (#35018)

---
 .../WorkspacesEditor/Models/Application.cs    | 31 +++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/src/modules/Workspaces/WorkspacesEditor/Models/Application.cs b/src/modules/Workspaces/WorkspacesEditor/Models/Application.cs
index c2fbd2ae5b..9f7be13742 100644
--- a/src/modules/Workspaces/WorkspacesEditor/Models/Application.cs
+++ b/src/modules/Workspaces/WorkspacesEditor/Models/Application.cs
@@ -358,6 +358,37 @@ namespace WorkspacesEditor.Models
                 if (_monitorSetup == null)
                 {
                     _monitorSetup = Parent.Monitors.Where(x => x.MonitorNumber == MonitorNumber).FirstOrDefault();
+                    if (_monitorSetup == null)
+                    {
+                        // monitors changed: try to determine monitor id based on middle point
+                        int middleX = Position.X + (Position.Width / 2);
+                        int middleY = Position.Y + (Position.Height / 2);
+                        var monitorCandidate = Parent.Monitors.Where(x =>
+                            (x.MonitorDpiUnawareBounds.Left < middleX) &&
+                            (x.MonitorDpiUnawareBounds.Right > middleX) &&
+                            (x.MonitorDpiUnawareBounds.Top < middleY) &&
+                            (x.MonitorDpiUnawareBounds.Bottom > middleY)).FirstOrDefault();
+                        if (monitorCandidate != null)
+                        {
+                            _monitorSetup = monitorCandidate;
+                            MonitorNumber = monitorCandidate.MonitorNumber;
+                        }
+                        else
+                        {
+                            // monitors and even the app's area unknown, set the main monitor (which is closer to (0,0)) as the app's monitor
+                            monitorCandidate = Parent.Monitors.OrderBy(x => Math.Abs(x.MonitorDpiUnawareBounds.Left) + Math.Abs(x.MonitorDpiUnawareBounds.Top)).FirstOrDefault();
+                            if (monitorCandidate != null)
+                            {
+                                _monitorSetup = monitorCandidate;
+                                MonitorNumber = monitorCandidate.MonitorNumber;
+                            }
+                            else
+                            {
+                                // no monitors defined at all.
+                                Logger.LogError($"Wrong workspace setup. No monitors defined for the workspace: {Parent.Name}.");
+                            }
+                        }
+                    }
                 }
 
                 return _monitorSetup;