fix(gui): workaround to force class decompilation in loading task (#2400)

jadx-core/src/main/java/jadx/api/JavaClass.java

@@ -122,8 +122,6 @@ public final class JavaClass implements JavaNode {
 		if (listsLoaded) {
 			return null;
 		}
-		listsLoaded = true;
-
 		ICodeInfo code;
 		if (cls.getState().isProcessComplete()) {
 			// already decompiled -> class internals loaded
@@ -131,7 +129,12 @@ public final class JavaClass implements JavaNode {
 		} else {
 			code = cls.decompile();
 		}
+		loadLists();
+		return code;
+	}
 
+	private void loadLists() {
+		listsLoaded = true;
 		JadxDecompiler rootDecompiler = getRootDecompiler();
 		int inClsCount = cls.getInnerClasses().size();
 		if (inClsCount != 0) {
@@ -139,7 +142,7 @@ public final class JavaClass implements JavaNode {
 			for (ClassNode inner : cls.getInnerClasses()) {
 				if (!inner.contains(AFlag.DONT_GENERATE)) {
 					JavaClass javaClass = rootDecompiler.convertClassNode(inner);
-					javaClass.load();
+					javaClass.loadLists();
 					list.add(javaClass);
 				}
 			}
@@ -150,7 +153,7 @@ public final class JavaClass implements JavaNode {
 			List<JavaClass> list = new ArrayList<>(inlinedClsCount);
 			for (ClassNode inner : cls.getInlinedClasses()) {
 				JavaClass javaClass = rootDecompiler.convertClassNode(inner);
-				javaClass.load();
+				javaClass.loadLists();
 				list.add(javaClass);
 			}
 			this.inlinedClasses = Collections.unmodifiableList(list);
@@ -178,7 +181,6 @@ public final class JavaClass implements JavaNode {
 			mths.sort(Comparator.comparing(JavaMethod::getName));
 			this.methods = Collections.unmodifiableList(mths);
 		}
-		return code;
 	}
 
 	JadxDecompiler getRootDecompiler() {

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

@@ -72,8 +72,9 @@ public class JClass extends JLoadableNode implements JRenameNode {
 	public SimpleTask getLoadTask() {
 		JClass rootClass = getRootClass();
 		return new SimpleTask(NLS.str("progress.decompile"),
-				() -> rootClass.getCls().decompile(),
-				rootClass::load);
+				() -> rootClass.getCls().getClassNode().decompile(), // run decompilation in background
+				rootClass::load // load class internals and update UI
+		);
 	}
 
 	private synchronized void load() {