core: fix 'if' processing in 'do/while' loop

jadx-core/src/main/java/jadx/core/dex/visitors/regions/RegionMaker.java

@@ -199,9 +199,11 @@ public class RegionMaker {
 			BlockNode thenBlock = condInfo.getThenBlock();
 			out = (thenBlock == loopStart ? condInfo.getElseBlock() : thenBlock);
 			loopStart.remove(AType.LOOP);
+			loop.getEnd().add(AFlag.SKIP);
 			stack.addExit(loop.getEnd());
 			loopRegion.setBody(makeRegion(loopStart, stack));
 			loopStart.addAttr(AType.LOOP, loop);
+			loop.getEnd().remove(AFlag.SKIP);
 		} else {
 			out = condInfo.getElseBlock();
 			if (outerRegion != null

jadx-core/src/test/java/jadx/tests/internal/loops/TestLoopConditionInvoke.java

@@ -0,0 +1,47 @@
+package jadx.tests.internal.loops;
+
+import jadx.api.InternalJadxTest;
+import jadx.core.dex.nodes.ClassNode;
+
+import org.junit.Test;
+
+import static jadx.tests.utils.JadxMatchers.containsOne;
+import static org.junit.Assert.assertThat;
+
+public class TestLoopConditionInvoke extends InternalJadxTest {
+
+	public static class TestCls {
+		private static final char STOP_CHAR = 0;
+		private int pos;
+
+		private boolean test(char lastChar) {
+			int startPos = pos;
+			char ch;
+			while ((ch = next()) != STOP_CHAR) {
+				if (ch == lastChar) {
+					return true;
+				}
+			}
+			pos = startPos;
+			return false;
+		}
+
+		private char next() {
+			return 0;
+		}
+	}
+
+	@Test
+	public void test() {
+		ClassNode cls = getClassNode(TestCls.class);
+		String code = cls.getCode().toString();
+		System.out.println(code);
+
+		assertThat(code, containsOne("do {"));
+		assertThat(code, containsOne("if (ch == '\\u0000') {"));
+		assertThat(code, containsOne("this.pos = startPos;"));
+		assertThat(code, containsOne("return false;"));
+		assertThat(code, containsOne("} while (ch != lastChar);"));
+		assertThat(code, containsOne("return true;"));
+	}
+}