Fix asymmetry of equals when element has trailing dashes

See gh-34804

Author: eydunn

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/source/ConfigurationPropertyName.java

@@ -406,7 +406,7 @@ private boolean dashIgnoringElementEquals(Elements e1, Elements e2, int i) {
 		int i2 = 0;
 		while (i1 < l1) {
 			if (i2 >= l2) {
-				return false;
+				return remainderIsNotAlphanumeric(e1, i, i1);
 			}
 			char ch1 = e1.charAt(i, i1);
 			char ch2 = e2.charAt(i, i2);

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/source/ConfigurationPropertyNameTests.java

@@ -702,6 +702,14 @@ void equalsWhenAdaptedNameMatchesDueToRemovalOfTrailingCharacters() {
 		assertThat(name2).isEqualTo(name1);
 	}
 
+	@Test
+	void equalsSymmetricWhenNameMatchesDueToRemovalOfTrailingDashes() {
+		ConfigurationPropertyName n1 = ConfigurationPropertyName.of("foobar");
+		ConfigurationPropertyName n2 = ConfigurationPropertyName.of("foobar--");
+		assertThat(n1).isEqualTo(n2);
+		assertThat(n2).isEqualTo(n1);
+	}
+
 	@Test
 	void isValidWhenValidShouldReturnTrue() {
 		assertThat(ConfigurationPropertyName.isValid("")).isTrue();