Slightly better error messages for ReplaceRegexStep.

Author: nedtwigg

lib/src/main/java/com/diffplug/spotless/generic/ReplaceRegexStep.java

@@ -90,7 +90,12 @@ public List<Lint> lint(String raw, File file) {
 					var matcher = regex.matcher(raw);
 					while (matcher.find()) {
 						int line = 1 + (int) raw.codePoints().limit(matcher.start()).filter(c -> c == '\n').count();
-						lints.add(Lint.atLine(line, matcher.group(0), lintDetail));
+						String errorCode = matcher.group(0).trim();
+						int firstNewline = errorCode.indexOf("\n");
+						if (firstNewline != -1) {
+							errorCode = errorCode.substring(0, firstNewline);
+						}
+						lints.add(Lint.atLine(line, errorCode, lintDetail));
 					}
 					return lints;
 				}

plugin-maven/src/test/java/com/diffplug/spotless/maven/java/RemoveWildcardImportsStepTest.java

@@ -31,16 +31,11 @@ void testRemoveWildcardImports() throws Exception {
 		setFile(path).toResource("java/removewildcardimports/JavaCodeWildcardsUnformatted.test");
 		expectSelfieErrorMsg(mavenRunner().withArguments("spotless:apply").runHasError()).toBe("""
 				Failed to execute goal com.diffplug.spotless:spotless-maven-plugin:VERSION:apply (default-cli) on project spotless-maven-plugin-tests: There were 5 lint error(s), they must be fixed or suppressed.
-				src/main/java/test.java:L1 removeWildcardImports(import java.util.*;
-				) Do not use wildcard imports (e.g. java.util.*) - replace with specific class imports (e.g. java.util.List) as 'spotlessApply' cannot auto-fix this
-				src/main/java/test.java:L2 removeWildcardImports(import static java.util.Collections.*;
-				) Do not use wildcard imports (e.g. java.util.*) - replace with specific class imports (e.g. java.util.List) as 'spotlessApply' cannot auto-fix this
-				src/main/java/test.java:L5 removeWildcardImports(import io.quarkus.maven.dependency.*;
-				) Do not use wildcard imports (e.g. java.util.*) - replace with specific class imports (e.g. java.util.List) as 'spotlessApply' cannot auto-fix this
-				src/main/java/test.java:L6 removeWildcardImports(import static io.quarkus.vertx.web.Route.HttpMethod.*;
-				) Do not use wildcard imports (e.g. java.util.*) - replace with specific class imports (e.g. java.util.List) as 'spotlessApply' cannot auto-fix this
-				src/main/java/test.java:L7 removeWildcardImports(import static org.springframework.web.reactive.function.BodyInserters.*;
-				) Do not use wildcard imports (e.g. java.util.*) - replace with specific class imports (e.g. java.util.List) as 'spotlessApply' cannot auto-fix this
+				src/main/java/test.java:L1 removeWildcardImports(import java.util.*;) Do not use wildcard imports (e.g. java.util.*) - replace with specific class imports (e.g. java.util.List) as 'spotlessApply' cannot auto-fix this
+				src/main/java/test.java:L2 removeWildcardImports(import static java.util.Collections.*;) Do not use wildcard imports (e.g. java.util.*) - replace with specific class imports (e.g. java.util.List) as 'spotlessApply' cannot auto-fix this
+				src/main/java/test.java:L5 removeWildcardImports(import io.quarkus.maven.dependency.*;) Do not use wildcard imports (e.g. java.util.*) - replace with specific class imports (e.g. java.util.List) as 'spotlessApply' cannot auto-fix this
+				src/main/java/test.java:L6 removeWildcardImports(import static io.quarkus.vertx.web.Route.HttpMethod.*;) Do not use wildcard imports (e.g. java.util.*) - replace with specific class imports (e.g. java.util.List) as 'spotlessApply' cannot auto-fix this
+				src/main/java/test.java:L7 removeWildcardImports(import static org.springframework.web.reactive.function.BodyInserters.*;) Do not use wildcard imports (e.g. java.util.*) - replace with specific class imports (e.g. java.util.List) as 'spotlessApply' cannot auto-fix this
 				Resolve these lints or suppress with `<lintSuppressions>`
 				""");
 		assertFile(path).sameAsResource("java/removewildcardimports/JavaCodeWildcardsFormatted.test");