Enforce few more rules

.editorconfig

@@ -272,3 +272,12 @@ csharp_style_var_elsewhere = true:warning
 [src/{EditorFeatures}/**/*.{cs,vb}]
 # CA1822: Make member static
 dotnet_diagnostic.CA1822.severity = warning
+
+# IDE0035: Remove unreachable code
+dotnet_diagnostic.IDE0035.severity = warning
+
+# IDE0036: Order modifiers
+dotnet_diagnostic.IDE0036.severity = warning
+
+# IDE0040: Add accessibility modifiers
+dotnet_diagnostic.IDE0040.severity = warning
\ No newline at end of file