Add TabColor property to connection info and implement tab coloring

Co-authored-by: Kvarkas <3611964+Kvarkas@users.noreply.github.com>

mRemoteNG/Config/Serializers/ConnectionSerializers/Xml/XmlConnectionNodeSerializer28.cs

@@ -42,6 +42,7 @@ namespace mRemoteNG.Config.Serializers.ConnectionSerializers.Xml
             element.Add(new XAttribute("Descr", connectionInfo.Description));
             element.Add(new XAttribute("Icon", connectionInfo.Icon));
             element.Add(new XAttribute("Panel", connectionInfo.Panel));
+            element.Add(new XAttribute("TabColor", connectionInfo.TabColor));
             element.Add(new XAttribute("Id", connectionInfo.ConstantID));
 
             if (!Runtime.UseCredentialManager)
@@ -187,6 +188,8 @@ namespace mRemoteNG.Config.Serializers.ConnectionSerializers.Xml
                 element.Add(new XAttribute("InheritIcon", inheritance.Icon.ToString().ToLowerInvariant()));
             if (inheritance.Panel)
                 element.Add(new XAttribute("InheritPanel", inheritance.Panel.ToString().ToLowerInvariant()));
+            if (inheritance.TabColor)
+                element.Add(new XAttribute("InheritTabColor", inheritance.TabColor.ToString().ToLowerInvariant()));
             if (inheritance.Password)
                 element.Add(new XAttribute("InheritPassword", inheritance.Password.ToString().ToLowerInvariant()));
             if (inheritance.Port)

mRemoteNG/Config/Serializers/ConnectionSerializers/Xml/XmlConnectionsDeserializer.cs

@@ -328,6 +328,7 @@ namespace mRemoteNG.Config.Serializers.ConnectionSerializers.Xml
                     connectionInfo.Inheritance.DisplayWallpaper = xmlnode.GetAttributeAsBool("InheritDisplayWallpaper");
                     connectionInfo.Inheritance.Icon = xmlnode.GetAttributeAsBool("InheritIcon");
                     connectionInfo.Inheritance.Panel = xmlnode.GetAttributeAsBool("InheritPanel");
+                    connectionInfo.Inheritance.TabColor = xmlnode.GetAttributeAsBool("InheritTabColor");
                     connectionInfo.Inheritance.Port = xmlnode.GetAttributeAsBool("InheritPort");
                     connectionInfo.Inheritance.Protocol = xmlnode.GetAttributeAsBool("InheritProtocol");
                     connectionInfo.Inheritance.PuttySession = xmlnode.GetAttributeAsBool("InheritPuttySession");
@@ -350,6 +351,7 @@ namespace mRemoteNG.Config.Serializers.ConnectionSerializers.Xml
 
                     connectionInfo.Icon = xmlnode.GetAttributeAsString("Icon");
                     connectionInfo.Panel = xmlnode.GetAttributeAsString("Panel");
+                    connectionInfo.TabColor = xmlnode.GetAttributeAsString("TabColor");
                 }
                 else
                 {

mRemoteNG/Connection/AbstractConnectionRecord.cs

@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using System.ComponentModel;
+using System.Drawing;
 using mRemoteNG.Connection.Protocol;
 using mRemoteNG.Connection.Protocol.Http;
 using mRemoteNG.Connection.Protocol.RDP;
@@ -22,6 +23,7 @@ namespace mRemoteNG.Connection
         private string _description;
         private string _icon;
         private string _panel;
+        private string _tabColor;
 
         private string _hostname;
         private ExternalAddressProvider _externalAddressProvider;
@@ -153,6 +155,16 @@ namespace mRemoteNG.Connection
             set => SetField(ref _panel, value, "Panel");
         }
 
+        [LocalizedAttributes.LocalizedCategory(nameof(Language.Display)),
+         LocalizedAttributes.LocalizedDisplayName(nameof(Language.TabColor)),
+         LocalizedAttributes.LocalizedDescription(nameof(Language.PropertyDescriptionTabColor)),
+         TypeConverter(typeof(ColorConverter))]
+        public virtual string TabColor
+        {
+            get => GetPropertyValue("TabColor", _tabColor);
+            set => SetField(ref _tabColor, value, "TabColor");
+        }
+
         #endregion
 
         #region Connection

mRemoteNG/Connection/ConnectionInfo.cs

@@ -289,6 +289,7 @@ namespace mRemoteNG.Connection
             Description = Settings.Default.ConDefaultDescription;
             Icon = Settings.Default.ConDefaultIcon;
             Panel = Language.General;
+            TabColor = "";
         }
 
         private void SetConnectionDefaults()

mRemoteNG/Connection/ConnectionInfoInheritance.cs

@@ -50,6 +50,12 @@ namespace mRemoteNG.Connection
          TypeConverter(typeof(MiscTools.YesNoTypeConverter))]
         public bool Panel { get; set; }
 
+        [LocalizedAttributes.LocalizedCategory(nameof(Language.Display), 2),
+         LocalizedAttributes.LocalizedDisplayNameInherit(nameof(Language.TabColor)),
+         LocalizedAttributes.LocalizedDescriptionInherit(nameof(Language.PropertyDescriptionTabColor)),
+         TypeConverter(typeof(MiscTools.YesNoTypeConverter))]
+        public bool TabColor { get; set; }
+
         #endregion
 
         #region Connection

mRemoteNG/Language/Language.resx

@@ -1020,6 +1020,9 @@ If you run into such an error, please create a new connection file!</value>
   <data name="PropertyDescriptionPanel" xml:space="preserve">
     <value>Sets the panel in which the connection will open.</value>
   </data>
+  <data name="PropertyDescriptionTabColor" xml:space="preserve">
+    <value>Sets the color of the connection tab. Leave empty for default theme color.</value>
+  </data>
   <data name="PropertyDescriptionPassword" xml:space="preserve">
     <value>Enter your password.</value>
   </data>
@@ -1182,6 +1185,9 @@ If you run into such an error, please create a new connection file!</value>
   <data name="Panel" xml:space="preserve">
     <value>Panel</value>
   </data>
+  <data name="TabColor" xml:space="preserve">
+    <value>Tab Color</value>
+  </data>
   <data name="Password" xml:space="preserve">
     <value>Password</value>
   </data>

mRemoteNG/UI/Tabs/DockPaneStripNG.cs

@@ -991,8 +991,11 @@ namespace mRemoteNG.UI.Tabs
             rectText = DrawHelper.RtlTransform(this, rectText);
             rectIcon = DrawHelper.RtlTransform(this, rectIcon);
 
-            Color activeColor = DockPane.DockPanel.Theme.ColorPalette.TabSelectedActive.Background;
-            Color lostFocusColor = DockPane.DockPanel.Theme.ColorPalette.TabSelectedInactive.Background;
+            // Get custom tab color if available
+            Color? customTabColor = GetCustomTabColor(tab.Content);
+
+            Color activeColor = customTabColor ?? DockPane.DockPanel.Theme.ColorPalette.TabSelectedActive.Background;
+            Color lostFocusColor = customTabColor ?? DockPane.DockPanel.Theme.ColorPalette.TabSelectedInactive.Background;
             Color inactiveColor = DockPane.DockPanel.Theme.ColorPalette.MainWindowActive.Background;
             Color mouseHoverColor = DockPane.DockPanel.Theme.ColorPalette.TabUnselectedHovered.Background;
 
@@ -1056,6 +1059,31 @@ namespace mRemoteNG.UI.Tabs
                 g.DrawIcon(tab.Content.DockHandler.Icon, rectIcon);
         }
 
+        private Color? GetCustomTabColor(IDockContent content)
+        {
+            try
+            {
+                if (content is ConnectionTab connectionTab)
+                {
+                    InterfaceControl interfaceControl = InterfaceControl.FindInterfaceControl(connectionTab);
+                    if (interfaceControl?.Info != null)
+                    {
+                        string tabColorStr = interfaceControl.Info.TabColor;
+                        if (!string.IsNullOrEmpty(tabColorStr))
+                        {
+                            ColorConverter converter = new ColorConverter();
+                            return (Color)converter.ConvertFromString(tabColorStr);
+                        }
+                    }
+                }
+            }
+            catch
+            {
+                // If there's any error parsing the color, just return null to use default
+            }
+            return null;
+        }
+
         private bool m_isMouseDown;
 
         protected bool IsMouseDown