Qt Editor: Make main loop calls more efficient

src/platform/C4App.cpp

@@ -32,10 +32,16 @@ void C4AbstractApp::Run()
 		// with its events (zero timeout). The alternative (calling Qt's event handling from
 		// C4Console::Execute) is too slow, at least on Linux.
 		QTimer timer;
-		QObject::connect(&timer, &QTimer::timeout, [this]() {
+		QObject::connect(&timer, &QTimer::timeout, [this, &timer]() {
 			ScheduleProcs(0);
 			if (fQuitMsgReceived)
+			{
 				QApplication::quit();
+				return;
+			}
+			auto now = C4TimeMilliseconds::Now();
+			auto next_tick = GetNextTick(now);
+			timer.setInterval(Clamp(next_tick - now, 0, 36/1000));
 		});
 		timer.start();
 		QApplication::exec();

src/platform/StdScheduler.cpp

@@ -130,22 +130,27 @@ C4TimeMilliseconds StdSchedulerProc::GetNextTick(C4TimeMilliseconds tNow)
 	return C4TimeMilliseconds::PositiveInfinity;
 }
 
+C4TimeMilliseconds StdScheduler::GetNextTick(C4TimeMilliseconds tNow)
+{
+	C4TimeMilliseconds tProcTick = C4TimeMilliseconds::PositiveInfinity;
+	for (auto proc : procs)
+	{
+		tProcTick = std::min(tProcTick, proc->GetNextTick(tNow));
+	}
+	return tProcTick;
+}
+
 bool StdScheduler::ScheduleProcs(int iTimeout)
 {
 	// Needs at least one process to work properly
 	if (!procs.size()) return false;
 
 	// Get timeout
-	C4TimeMilliseconds tProcTick;
 	C4TimeMilliseconds tNow = C4TimeMilliseconds::Now();
-	for (auto i = 0u; i < procs.size(); i++)
+	C4TimeMilliseconds tProcTick = GetNextTick(tNow);
+	if (iTimeout == -1 || tNow + iTimeout > tProcTick)
 	{
-		auto proc = procs[i];
-		tProcTick = proc->GetNextTick(tNow);
-		if (iTimeout == -1 || tNow + iTimeout > tProcTick)
-		{
-			iTimeout = std::max<decltype(iTimeout)>(tProcTick - tNow, 0);
-		}
+		iTimeout = std::max<decltype(iTimeout)>(tProcTick - tNow, 0);
 	}
 	
 	bool old = isInManualLoop;

src/platform/StdScheduler.h

@@ -263,6 +263,7 @@ public:
 	// needs to be called on thread tasks for this scheduler are meant to be run on
 	void StartOnCurrentThread();
 
+	C4TimeMilliseconds GetNextTick(C4TimeMilliseconds tNow);
 	bool ScheduleProcs(int iTimeout = 1000/36);
 	void UnBlock();