Improve version upgrade suggestions when version is aligned

Closes gh-44132

Author: wilkinsona

buildSrc/src/main/java/org/springframework/boot/build/bom/bomr/InteractiveUpgradeResolver.java

@@ -23,10 +23,13 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
+import java.util.Set;
 
 import org.gradle.api.internal.tasks.userinput.UserInputHandler;
 
 import org.springframework.boot.build.bom.Library;
+import org.springframework.boot.build.bom.Library.VersionAlignment;
+import org.springframework.boot.build.bom.bomr.version.DependencyVersion;
 
 /**
  * Interactive {@link UpgradeResolver} that uses command line input to choose the upgrades
@@ -69,11 +72,23 @@ private Upgrade resolveUpgrade(LibraryWithVersionOptions libraryWithVersionOptio
 		if (versionOptions.isEmpty()) {
 			return null;
 		}
-		VersionOption defaultOption = new VersionOption(library.getVersion().getVersion());
+		VersionOption defaultOption = defaultOption(library);
 		VersionOption selected = selectOption(defaultOption, library, versionOptions);
 		return (selected.equals(defaultOption)) ? null : new Upgrade(library, selected.getVersion());
 	}
 
+	private VersionOption defaultOption(Library library) {
+		VersionAlignment alignment = library.getVersionAlignment();
+		Set<String> alignedVersions = (alignment != null) ? alignment.resolve() : null;
+		if (alignedVersions != null && alignedVersions.size() == 1) {
+			DependencyVersion alignedVersion = DependencyVersion.parse(alignedVersions.iterator().next());
+			if (alignedVersion.equals(library.getVersion().getVersion())) {
+				return new VersionOption.AlignedVersionOption(alignedVersion, alignment);
+			}
+		}
+		return new VersionOption(library.getVersion().getVersion());
+	}
+
 	private VersionOption selectOption(VersionOption defaultOption, Library library,
 			List<VersionOption> versionOptions) {
 		VersionOption selected = this.userInputHandler.askUser((questions) -> {

buildSrc/src/main/java/org/springframework/boot/build/bom/bomr/StandardLibraryUpdateResolver.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2024 the original author or authors.
+ * Copyright 2012-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -78,8 +78,17 @@ protected boolean isLibraryExcluded(Library library) {
 	}
 
 	protected List<VersionOption> getVersionOptions(Library library) {
-		VersionOption option = determineAlignedVersionOption(library);
-		return (option != null) ? List.of(option) : determineResolvedVersionOptions(library);
+		List<VersionOption> options = new ArrayList<>();
+		VersionOption alignedOption = determineAlignedVersionOption(library);
+		if (alignedOption != null) {
+			options.add(alignedOption);
+		}
+		for (VersionOption resolvedOption : determineResolvedVersionOptions(library)) {
+			if (alignedOption == null || !alignedOption.getVersion().equals(resolvedOption.getVersion())) {
+				options.add(resolvedOption);
+			}
+		}
+		return options;
 	}
 
 	private VersionOption determineAlignedVersionOption(Library library) {