Consistently handle match with '*' and trailing slash

Prior to this commit, the `AntPathMatcher` would inconsistently match
pattern with trailing slashes if they contain `"**"` within their
pattern.

For example `"/en/test/"` would match `"/**/test"`, but it would not
match `"/*/test"` (as it should).

This commit fixes this behavior for better consistency.

Fixes gh-27506

spring-core/src/main/java/org/springframework/util/AntPathMatcher.java

@@ -275,6 +275,10 @@ public class AntPathMatcher implements PathMatcher {
 			if (!matchStrings(pattDir, pathDirs[pathIdxEnd], uriTemplateVariables)) {
 				return false;
 			}
+			if (pattIdxEnd == (pattDirs.length - 1)
+					&& pattern.endsWith(this.pathSeparator) != path.endsWith(this.pathSeparator)) {
+				return false;
+			}
 			pattIdxEnd--;
 			pathIdxEnd--;
 		}

spring-core/src/test/java/org/springframework/util/AntPathMatcherTests.java

@@ -704,4 +704,11 @@ class AntPathMatcherTests {
 		assertThat(pathMatcher.isPattern(null)).isFalse();
 	}
 
+	@Test // gh-27506
+	void consistentMatchWithWildcardsAndTrailingSlash() {
+		assertThat(pathMatcher.match("/*/foo", "/en/foo")).isTrue();
+		assertThat(pathMatcher.match("/*/foo", "/en/foo/")).isFalse();
+		assertThat(pathMatcher.match("/**/foo", "/en/foo")).isTrue();
+		assertThat(pathMatcher.match("/**/foo", "/en/foo/")).isFalse();
+	}
 }