WinForms Example - Make DPI Aware

- WinForms Example is now DPI aware using https://docs.microsoft.com/en-us/dotnet/desktop/winforms/high-dpi-support-in-windows-forms?view=netframeworkdesktop-4.8
  There's a mistake in the MS Docs which was already reported at dotnet/docs-desktop#1485
- Toolstrip layout updated slightly, could use some more minor tweaks to better calculate size

Resolves #1543

Author: amaitland

CefSharp.WinForms.Example/AboutBox.cs

@@ -77,7 +77,7 @@ public AboutBox()
             InitializeComponent();
             ExecutingAssembly = Assembly.GetExecutingAssembly();
 
-            Text = "About CefTest";
+            Text = "About CefSharp.WinForms.Example";
             labelProductName.Text = AssemblyProduct;
             labelVersion.Text = String.Format("Version {0} ", Cef.CefSharpVersion);
             labelCopyright.Text = AssemblyCopyright;

CefSharp.WinForms.Example/BrowserTabUserControl.cs

@@ -444,7 +444,7 @@ private void HandleToolStripLayout()
                     width -= item.Width - item.Margin.Horizontal;
                 }
             }
-            urlTextBox.Width = Math.Max(0, width - urlTextBox.Margin.Horizontal - 18);
+            urlTextBox.Width = Math.Max(100, width - urlTextBox.Margin.Horizontal - goButton.Width);
         }
 
         private void GoButtonClick(object sender, EventArgs e)

CefSharp.WinForms.Example/Minimal/SimpleBrowserForm.cs

@@ -138,7 +138,7 @@ private void HandleToolStripLayout()
                     width -= item.Width - item.Margin.Horizontal;
                 }
             }
-            urlTextBox.Width = Math.Max(0, width - urlTextBox.Margin.Horizontal - 18);
+            urlTextBox.Width = Math.Max(100, width - urlTextBox.Margin.Horizontal - goButton.Width);
         }
 
         private void ExitMenuItemClick(object sender, EventArgs e)

CefSharp.WinForms.Example/Program.cs

@@ -17,14 +17,24 @@ public class Program
         [STAThread]
         public static int Main(string[] args)
         {
+            // DEMO: Change to true to self host the BrowserSubprocess.
+            // instead of using CefSharp.BrowserSubprocess.exe, your applications exe will be used.
+            // In this case CefSharp.WinForms.Example.exe
             const bool selfHostSubProcess = false;
 
-            Cef.EnableHighDPISupport();
-
-            //NOTE: Using a simple sub processes uses your existing application executable to spawn instances of the sub process.
-            //Features like JSB, EvaluateScriptAsync, custom schemes require the CefSharp.BrowserSubprocess to function
             if (selfHostSubProcess)
             {
+                var processType = CefSharp.Internals.CommandLineArgsParser.GetArgumentValue(args, CefSharp.Internals.CefSharpArguments.SubProcessTypeArgument);
+
+                if (processType == "gpu-process")
+                {
+                    // Enable DPI Awareness for GPU process.
+                    // Our main application is already DPI aware using WinForms specific features
+                    // **IMPORTANT** There's a mistake in the following doc https://github.com/dotnet/docs-desktop/issues/1485
+                    // https://docs.microsoft.com/en-us/dotnet/desktop/winforms/high-dpi-support-in-windows-forms
+                    Cef.EnableHighDPISupport();
+                }
+
                 var exitCode = CefSharp.BrowserSubprocess.SelfHost.Main(args);
 
                 if (exitCode >= 0)
@@ -45,6 +55,7 @@ public static int Main(string[] args)
 
                 Cef.Initialize(settings);
 
+                Application.EnableVisualStyles();
                 var browser = new SimpleBrowserForm();
                 Application.Run(browser);
             }
@@ -58,11 +69,14 @@ public static int Main(string[] args)
                 }
 #endif
 
-                //When multiThreadedMessageLoop = true then externalMessagePump must be set to false
-                // To enable externalMessagePump set  multiThreadedMessageLoop = false and externalMessagePump = true
+                // DEMO: To integrate CEF into your applications existing message loop 
+                // set multiThreadedMessageLoop = false;
                 const bool multiThreadedMessageLoop = true;
+                // When multiThreadedMessageLoop = true then externalMessagePump must be set to false
+                // To enable externalMessagePump set  multiThreadedMessageLoop = false and externalMessagePump = true
                 const bool externalMessagePump = false;
 
+                //TEST: There are a number of different Forms for testing purposes.
                 var browser = new BrowserForm(multiThreadedMessageLoop);
                 //var browser = new SimpleBrowserForm(multiThreadedMessageLoop);
                 //var browser = new TabulationDemoForm();
@@ -95,6 +109,7 @@ public static int Main(string[] args)
 
                 CefExample.Init(settings, browserProcessHandler: browserProcessHandler);
 
+                Application.EnableVisualStyles();
                 //Application.Run(new MultiFormAppContext());
                 Application.Run(browser);
             }

CefSharp.WinForms.Example/app.config

@@ -1,3 +1,10 @@
 <?xml version="1.0"?>
 <configuration>
-<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2"/></startup></configuration>
+  <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2"/>
+  </startup>
+
+  <System.Windows.Forms.ApplicationConfigurationSection>
+    <add key="DpiAwareness" value="PerMonitorV2" />
+  </System.Windows.Forms.ApplicationConfigurationSection>
+</configuration>

CefSharp.WinForms.Example/app.manifest

@@ -34,12 +34,6 @@
     </security>
   </trustInfo>
 
-  <asmv3:application>
-    <asmv3:windowsSettings xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">
-      <dpiAware>true/PM</dpiAware>
-    </asmv3:windowsSettings>
-  </asmv3:application>
-
   <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
     <application>
       <!-- A list of all Windows versions that this application is designed to work with.