Fix bug where restart fast-forwarded the new run by the time spent in a modal dialog

src/test/SimulationTest.cpp

@@ -131,3 +131,26 @@ TEST_CASE("TickDriver::reset clears the accumulator", "[simulation]")
     // Nothing in the accumulator: zero elapsed time should not fire.
     REQUIRE(driver.advance(0.0, 1.0) == 0);
 }
+
+TEST_CASE("TickDriver::reset discards a large pending delta so a restart does not "
+          "fast-forward", "[simulation]")
+{
+    // Regression guard for the "restart fast-forwards by the time spent in the
+    // Game Over / Win / escape dialog" bug: on restart the frame timer holds the
+    // whole wall-clock duration the modal was open. GameWorldView::resetForNewGame()
+    // now calls TickDriver::reset() to discard that pending delta; without it the
+    // fresh run would burst forward by the dialog duration on its first frame.
+    TickDriver driver;
+
+    // 30 seconds spent in the dialog would otherwise be ~900 ticks at 30 Hz.
+    const double dialogOpenMs = 30000.0;
+    driver.reset();
+
+    // A brand-new run's first normal frame (~16 ms) advances only its own ticks;
+    // the discarded dialog time contributes nothing.
+    REQUIRE(driver.advance(16.0, 1.0) == 0);
+
+    // Sanity: had the dialog delta not been discarded, it would have fired ~900 ticks.
+    TickDriver leaked;
+    REQUIRE(leaked.advance(dialogOpenMs, 1.0) > 800);
+}