add test case for robustness against accidental selections in `merge_…

…match_arms`

crates/ide-assists/src/handlers/merge_match_arms.rs

@@ -367,6 +367,36 @@ fn main() {
         );
     }
 
+    #[test]
+    fn merge_match_arms_works_despite_accidental_selection() {
+        check_assist(
+            merge_match_arms,
+            r#"
+#[derive(Debug)]
+enum X { A, B, C }
+
+fn main() {
+    match X::A {
+        X::$0A$0 => 0,
+        X::B => 0,
+        X::C => 1,
+    }
+}
+"#,
+            r#"
+#[derive(Debug)]
+enum X { A, B, C }
+
+fn main() {
+    match X::A {
+        X::A | X::B => 0,
+        X::C => 1,
+    }
+}
+"#,
+        );
+    }
+
     #[test]
     fn merge_match_arms_rejects_guards() {
         check_assist_not_applicable(