fix(forge): keep gas memory on gas metering reset (#12539)

Author: grandizzy

crates/cheatcodes/src/inspector.rs

@@ -1954,7 +1954,10 @@ impl Cheatcodes {
 
     #[cold]
     fn meter_gas_reset(&mut self, interpreter: &mut Interpreter) {
-        interpreter.gas = Gas::new(interpreter.gas.limit());
+        let mut gas = Gas::new(interpreter.gas.limit());
+        gas.memory_mut().words_num = interpreter.gas.memory().words_num;
+        gas.memory_mut().expansion_cost = interpreter.gas.memory().expansion_cost;
+        interpreter.gas = gas;
         self.gas_metering.reset = false;
     }
 

crates/forge/tests/cli/test_cmd/mod.rs

@@ -1744,6 +1744,15 @@ contract ATest is DSTest {
         b = new B();
         vm.resetGasMetering();
     }
+
+    // https://github.com/foundry-rs/foundry/issues/12474
+    function testMemoryOnReset(uint8[1] memory x) public {
+        uint8[1] memory z;
+        z[0] = x[0];
+        assertEq(z[0], x[0]);
+        vm.resetGasMetering();
+        assertEq(x[0], z[0]);
+    }
 }
      "#,
     );