Fix #12471 FP incorrectLogicOperator, followVariables does not seem to care about setter (#6051)

Author: chrchr-github

lib/astutils.cpp

@@ -2942,8 +2942,9 @@ static const Token* findExpressionChangedImpl(const Token* expr,
     const Token* result = nullptr;
     findAstNode(expr, [&](const Token* tok) {
         if (exprDependsOnThis(tok)) {
-            result = findThisChanged(start, end, false, settings, cpp);
-            return true;
+            result = findThisChanged(start, end, /*indirect*/ 0, settings, cpp);
+            if (result)
+                return true;
         }
         bool global = false;
         if (tok->variable()) {

test/testcondition.cpp

@@ -70,6 +70,7 @@ class TestCondition : public TestFixture {
         TEST_CASE(incorrectLogicOperator14);
         TEST_CASE(incorrectLogicOperator15);
         TEST_CASE(incorrectLogicOperator16); // #10070
+        TEST_CASE(incorrectLogicOperator17);
         TEST_CASE(secondAlwaysTrueFalseWhenFirstTrueError);
         TEST_CASE(incorrectLogicOp_condSwapping);
         TEST_CASE(testBug5895);
@@ -1722,6 +1723,24 @@ class TestCondition : public TestFixture {
         ASSERT_EQUALS("", errout.str());
     }
 
+    void incorrectLogicOperator17() { // #12471
+        check("struct R {\n"
+              "    void set() { i = 1; }\n"
+              "    int get() const { return i; }\n"
+              "    int i;\n"
+              "};\n"
+              "struct P {\n"
+              "    void f();\n"
+              "    R* r;\n"
+              "};\n"
+              "void P::f() {\n"
+              "    int a = r->get();\n"
+              "    r->set();\n"
+              "    if (a == 0 && r->get()) {}\n"
+              "}\n");
+        ASSERT_EQUALS("", errout.str());
+    }
+
     void secondAlwaysTrueFalseWhenFirstTrueError() {
         check("void f(void) {\n" // #8892
               "    const char c[1] = { \'x\' }; \n"