fixes

src/kiwano/core/Time.cpp

@@ -250,11 +250,12 @@ String Duration::ToString() const
         return String("0s");
     }
 
-    String   result;
+    StringStream stream;
+
     int64_t total_ms = milliseconds_;
     if (total_ms < 0)
     {
-        result.append("-");
+        stream << "-";
         total_ms = -total_ms;
     }
 
@@ -265,23 +266,22 @@ String Duration::ToString() const
 
     if (hour)
     {
-        result.append(std::to_string(hour)).append("h");
-        result.append(std::to_string(min)).append("m");
+        stream << hour << 'h' << min << 'm';
     }
     else if (min)
     {
-        result.append(std::to_string(min)).append("m");
+        stream << min << 'm';
     }
 
     if (ms != 0)
     {
-        result.append(std::to_string(static_cast<float>(sec + ms) / 1000.f)).append("s");
+        stream << float(sec) + float(ms) / 1000.f << 's';
     }
     else if (sec != 0)
     {
-        result.append(std::to_string(sec)).append("s");
+        stream << sec << 's';
     }
-    return result;
+    return stream.str();
 }
 
 bool Duration::operator==(const Duration& other) const

src/kiwano/utils/Task.cpp

@@ -62,8 +62,31 @@ Task::Task()
 {
 }
 
+void Task::Start()
+{
+    if (!running_)
+    {
+        running_ = true;
+        if (ticker_)
+            ticker_->Resume();
+    }
+}
+
+void Task::Stop()
+{
+    if (running_)
+    {
+        running_ = false;
+        if (ticker_)
+            ticker_->Pause();
+    }
+}
+
 void Task::Update(Duration dt)
 {
+    if (!running_ || removeable_)
+        return;
+
     if (!ticker_ || ticker_->GetTotalTickCount() == 0)
     {
         Remove();

src/kiwano/utils/Task.h

@@ -129,16 +129,6 @@ private:
     Callback  callback_;
 };
 
-inline void Task::Start()
-{
-    running_ = true;
-}
-
-inline void Task::Stop()
-{
-    running_ = false;
-}
-
 inline void Task::Remove()
 {
     removeable_ = true;
@@ -162,6 +152,13 @@ inline TickerPtr Task::GetTicker() const
 inline void Task::SetTicker(TickerPtr ticker)
 {
     ticker_ = ticker;
+    if (ticker_)
+    {
+        if (running_)
+            ticker_->Resume();
+        else
+            ticker_->Pause();
+    }
 }
 
 inline Task::Callback Task::GetCallback() const