handle raw strings when indentation changes from tabs to spaces (#1180)

Src/CSharpier.Tests/SyntaxNodeComparerTests.cs

@@ -585,6 +585,48 @@ public void RawStringLiterals_Work_With_Moving_Indentation_3()
         result.Should().BeEmpty();
     }
 
+    [Test]
+    public void RawStringLiterals_Work_With_Moving_Indentation_And_Tabs_To_Spaces()
+    {
+        var left = """"
+	var someValue = $"""
+		SomeRawStringWithTab
+	""";
+
+"""";
+        var right = """"
+    var someValue = $"""
+        	SomeRawStringWithTab
+        """;
+
+"""";
+
+        var result = CompareSource(left, right);
+
+        result.Should().BeEmpty();
+    }
+
+    [Test]
+    public void RawStringLiterals_Errors_When_Tabs_Change_To_Spaces()
+    {
+        var left = """"
+var someValue = $"""
+    	SomeRawStringWithTab
+    """;
+
+"""";
+        var right = """"
+var someValue = $"""
+        SomeRawStringWithTab
+    """;
+
+"""";
+
+        var result = CompareSource(left, right);
+
+        result.Should().NotBeEmpty();
+    }
+
     [Test]
     public void RawStringLiterals_Error_With_Adding_Indentation_When_There_Was_None()
     {

Src/CSharpier/SyntaxNodeComparer.cs

@@ -239,9 +239,12 @@ originalToken.Parent is InterpolatedStringExpressionSyntax
         )
         {
             // this detects if we added indentation when there was none, or removed all indentation when there was some
+            // and handles the case of changing /t to " "
+            var originalFirst = originalToken.ValueText.TrimStart(['\r', '\n'])[0];
+            var formattedFirst = formattedToken.ValueText.TrimStart(['\r', '\n'])[0];
             if (
-                originalToken.ValueText.TrimStart(['\r', '\n'])[0]
-                != formattedToken.ValueText.TrimStart(['\r', '\n'])[0]
+                originalFirst != formattedFirst
+                && (originalFirst is not (' ' or '\t') || formattedFirst is not (' ' or '\t'))
             )
             {
                 return NotEqual(originalToken.Span, formattedNode!.Span);