fix: gets doubled EOLs while coping content with CRLF line-endings in diff view (#2091)

Signed-off-by: leo <longshuang@msn.cn>

Author: love-linger

src/Native/OS.cs

@@ -116,21 +116,13 @@ public static bool UseSystemWindowFrame
         static OS()
         {
             if (OperatingSystem.IsWindows())
-            {
                 _backend = new Windows();
-            }
             else if (OperatingSystem.IsMacOS())
-            {
                 _backend = new MacOS();
-            }
             else if (OperatingSystem.IsLinux())
-            {
                 _backend = new Linux();
-            }
             else
-            {
                 throw new PlatformNotSupportedException();
-            }
         }
 
         public static void SetupDataDir()
@@ -167,11 +159,7 @@ public static bool TestShellOrTerminal(Models.ShellOrTerminal shell)
 
         public static void SetShellOrTerminal(Models.ShellOrTerminal shell)
         {
-            if (shell == null)
-                ShellOrTerminal = string.Empty;
-            else
-                ShellOrTerminal = _backend.FindTerminal(shell);
-
+            ShellOrTerminal = shell != null ? _backend.FindTerminal(shell) : string.Empty;
             ShellOrTerminalArgs = shell.Args;
         }
 

src/Views/TextDiffView.axaml.cs

@@ -841,15 +841,14 @@ private async Task CopyWithoutIndicatorsAsync()
                 // The first selected line (partial selection)
                 if (i == startIdx && startPosition.Column > 1)
                 {
-                    builder.Append(line.Content.AsSpan(startPosition.Column - 1));
-                    builder.Append(Environment.NewLine);
+                    builder.Append(line.Content.AsSpan(startPosition.Column - 1)).Append('\n');
                     continue;
                 }
 
                 // The selection range is larger than original source.
                 if (i == lines.Count - 1 && i < endIdx)
                 {
-                    builder.Append(line.Content);
+                    builder.Append(line.Content).Append('\n');
                     break;
                 }
 
@@ -865,7 +864,7 @@ private async Task CopyWithoutIndicatorsAsync()
                 }
 
                 // Other lines.
-                builder.AppendLine(line.Content);
+                builder.Append(line.Content).Append('\n');
             }
 
             await App.CopyTextAsync(builder.ToString());