At midnight, "shift" the step counter history

src/components/motion/MotionController.cpp

@@ -36,6 +36,11 @@ namespace {
   }
 }
 
+void MotionController::AdvanceDay() {
+  --nbSteps; // Higher index = further in the past
+  nbSteps[today] = -1; // Ensure that the `this->nbSteps[today] != nbSteps` condition in `Update()` will be FALSE
+}
+
 void MotionController::Update(int16_t x, int16_t y, int16_t z, MotionController::step_t nbSteps) {
   if (this->nbSteps[today] != nbSteps && service != nullptr) {
     service->OnNewStepCountValue(nbSteps);

src/components/motion/MotionController.h

@@ -27,6 +27,8 @@ namespace Pinetime {
       using step_t = uint32_t;
       static constexpr size_t stepHistorySize = 2; // Store this many day's step counter
 
+      void AdvanceDay();
+
       void Update(int16_t x, int16_t y, int16_t z, step_t nbSteps);
 
       int16_t X() const {

src/systemtask/SystemTask.cpp

@@ -428,6 +428,7 @@ void SystemTask::UpdateMotion() {
 
   if (stepCounterMustBeReset) {
     motionSensor.ResetStepCounter();
+    motionController.AdvanceDay();
     stepCounterMustBeReset = false;
   }