fix(gui): don't reset package alias on class rename (#1732)

jadx-core/src/main/java/jadx/core/dex/info/ClassInfo.java

@@ -9,6 +9,7 @@ import org.jetbrains.annotations.Nullable;
 import jadx.core.dex.instructions.args.ArgType;
 import jadx.core.dex.nodes.ClassNode;
 import jadx.core.dex.nodes.RootNode;
+import jadx.core.utils.StringUtils;
 import jadx.core.utils.exceptions.JadxRuntimeException;
 
 public final class ClassInfo implements Comparable<ClassInfo> {
@@ -59,13 +60,21 @@ public final class ClassInfo implements Comparable<ClassInfo> {
 	}
 
 	public void changeShortName(String aliasName) {
-		if (!Objects.equals(name, aliasName)) {
-			ClassAliasInfo newAlias = new ClassAliasInfo(getAliasPkg(), aliasName);
-			fillAliasFullName(newAlias);
-			this.alias = newAlias;
+		ClassAliasInfo newAlias;
+		String aliasPkg = getAliasPkg();
+		if (Objects.equals(name, aliasName) || StringUtils.isEmpty(aliasName)) {
+			if (Objects.equals(getPackage(), aliasPkg)) {
+				newAlias = null;
+			} else {
+				newAlias = new ClassAliasInfo(aliasPkg, name);
+			}
 		} else {
-			this.alias = null;
+			newAlias = new ClassAliasInfo(aliasPkg, aliasName);
 		}
+		if (newAlias != null) {
+			fillAliasFullName(newAlias);
+		}
+		this.alias = newAlias;
 	}
 
 	public void changePkg(String aliasPkg) {

jadx-gui/src/main/java/jadx/gui/treemodel/JClass.java

@@ -220,7 +220,8 @@ public class JClass extends JLoadableNode implements JRenameNode {
 
 	@Override
 	public void removeAlias() {
-		cls.removeAlias();
+		// reset only short name, package name should be reset explicitly using PackageNode
+		cls.getClassNode().rename("");
 	}
 
 	@Override

jadx-gui/src/main/java/jadx/gui/ui/dialog/RenameDialog.java

@@ -125,8 +125,9 @@ public class RenameDialog extends JDialog {
 	private void processRename(String newName, Set<ICodeRename> renames) {
 		ICodeRename rename = node.buildCodeRename(newName, renames);
 		renames.remove(rename);
-		node.removeAlias();
-		if (!newName.isEmpty()) {
+		if (newName.isEmpty()) {
+			node.removeAlias();
+		} else {
 			renames.add(rename);
 		}
 	}

jadx-gui/src/main/java/jadx/gui/utils/pkgs/JRenamePackage.java

@@ -99,4 +99,9 @@ public class JRenamePackage implements JRenameNode {
 		mainWindow.rebuildPackagesTree();
 		mainWindow.reloadTree();
 	}
+
+	@Override
+	public String toString() {
+		return refPkg.toString();
+	}
 }