From 4473092c7e62d031f61163b1badd7ce6f07e6193 Mon Sep 17 00:00:00 2001
From: chrchr-github <78114321+chrchr-github@users.noreply.github.com>
Date: Mon, 12 Aug 2024 18:23:23 +0200
Subject: [PATCH 1/4] Update qt.cfg

---
 cfg/qt.cfg | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cfg/qt.cfg b/cfg/qt.cfg
index 9f6540a310c..2011c66f760 100644
--- a/cfg/qt.cfg
+++ b/cfg/qt.cfg
@@ -5078,7 +5078,7 @@
   <container id="qtContainer" endPattern="&gt; !!::" opLessAllowed="false" itEndPattern="&gt; :: iterator|const_iterator">
     <type templateParameter="0"/>
     <size>
-      <function name="append" action="push"/>
+      <function name="append" action="append"/>
       <function name="clear" action="clear"/>
       <function name="count" yields="size"/>
       <function name="erase" action="erase"/>

From c1e9f0adacb7e20c15ea944dd7e6c0bd42f346e0 Mon Sep 17 00:00:00 2001
From: chrchr-github <78114321+chrchr-github@users.noreply.github.com>
Date: Mon, 12 Aug 2024 18:25:43 +0200
Subject: [PATCH 2/4] Update qt.cpp

---
 test/cfg/qt.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/test/cfg/qt.cpp b/test/cfg/qt.cpp
index 2c0e836f7f3..ce68cbf5e5f 100644
--- a/test/cfg/qt.cpp
+++ b/test/cfg/qt.cpp
@@ -323,6 +323,13 @@ QList<int>::iterator QList3()
     return it;
 }
 
+void QList4() // #13001
+{
+    QList<int> ql;
+    ql.append(QList<int>>());
+    if (ql.isEmpty()) {}
+}
+
 void QLinkedList1()
 {
     // cppcheck-suppress unreadVariable

From 743dcef84fe8b262e87650b6d6e9b4bfea90f45f Mon Sep 17 00:00:00 2001
From: chrchr-github <78114321+chrchr-github@users.noreply.github.com>
Date: Mon, 12 Aug 2024 18:58:16 +0200
Subject: [PATCH 3/4] Update valueflow.cpp

---
 lib/valueflow.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/valueflow.cpp b/lib/valueflow.cpp
index 72da844aa87..dffd3ba91ec 100644
--- a/lib/valueflow.cpp
+++ b/lib/valueflow.cpp
@@ -6574,6 +6574,10 @@ struct ContainerExpressionAnalyzer : ExpressionAnalyzer {
                 n = -1;
                 break;
             case Library::Container::Action::APPEND: {
+                if (!container->stdStringLike) {
+                    val->setPossible(); // TODO: use appendee's size
+                    break;
+                }
                 std::vector<const Token*> args = getArguments(tok->astParent()->tokAt(2));
                 if (args.size() == 1) // TODO: handle overloads
                     n = valueFlowGetStrLength(tok->astParent()->tokAt(3));

From 626b04276dcdb9fb5084d3d5bf980b1097bee394 Mon Sep 17 00:00:00 2001
From: chrchr-github <78114321+chrchr-github@users.noreply.github.com>
Date: Mon, 12 Aug 2024 19:06:35 +0200
Subject: [PATCH 4/4] Update qt.cpp

---
 test/cfg/qt.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/cfg/qt.cpp b/test/cfg/qt.cpp
index ce68cbf5e5f..7059a75d78b 100644
--- a/test/cfg/qt.cpp
+++ b/test/cfg/qt.cpp
@@ -326,7 +326,7 @@ QList<int>::iterator QList3()
 void QList4() // #13001
 {
     QList<int> ql;
-    ql.append(QList<int>>());
+    ql.append(QList<int>());
     if (ql.isEmpty()) {}
 }