Small edge case local declaration fix

Underanalyzer/Decompiler/AST/LocalScope.cs

@@ -204,7 +204,7 @@ public void GenerateDeclarations(HashSet<string> declaredAnywhere)
             }
         }
 
-        // For remaining locals declared in this scope, declare them on their first assignments
+        // For remaining locals to be declared in this scope, declare them on their first assignments
         foreach (string local in DeclaredLocals)
         {
             if (hoistedLocals.Contains(local))

Underanalyzer/Decompiler/AST/Nodes/AssignNode.cs

@@ -158,6 +158,7 @@ binary.Instruction.Kind is Opcode.Add or Opcode.Subtract or Opcode.Multiply or O
     public IStatementNode PostClean(ASTCleaner cleaner)
     {
         if (cleaner.Context.Settings.CleanupLocalVarDeclarations &&
+            AssignKind == AssignType.Normal &&
             Variable is VariableNode
             {
                 Left: Int16Node { Value: (int)InstanceType.Local } or InstanceTypeNode { InstanceType: InstanceType.Local },

UnderanalyzerTest/DecompileContext.DecompileToString.Locals.cs

@@ -103,6 +103,50 @@ pop.v.i local.a
         );
     }
 
+    [Fact]
+    public void TestOnlyIncrementLocal()
+    {
+        TestUtil.VerifyDecompileResult(
+            """
+            :[0]
+            push.v local.a
+            pushi.e 1
+            add.i.v
+            pop.v.v local.a
+            """,
+            """
+            var a;
+            a += 1;
+            """
+        );
+    }
+
+    [Fact]
+    public void TestOnlyIncrementLocal2()
+    {
+        TestUtil.VerifyDecompileResult(
+            """
+            :[0]
+            push.v local.a
+            pushi.e 1
+            add.i.v
+            pop.v.v local.a
+            pushi.e -7
+            pushi.e 0
+            dup.i 1
+            push.v [array]local.b
+            pushi.e 1
+            add.i.v
+            pop.i.v [array]local.b
+            """,
+            """
+            var a, b;
+            a += 1;
+            b[0] += 1;
+            """
+        );
+    }
+
     [Fact]
     public void TestFunctionLocal1()
     {