Disable Vsync while holding tab to disable the frame limit.

Fixes issue 6111.

Source/Core/Core/Src/Core.cpp

@@ -71,6 +71,8 @@
 #include "State.h"
 #include "Movie.h"
 
+#include "VideoConfig.h"
+
 // TODO: ugly, remove
 bool g_aspect_wide;
 
@@ -603,6 +605,25 @@ void VideoThrottle()
 	u32 TargetVPS = (SConfig::GetInstance().m_Framelimit > 2) ?
 		(SConfig::GetInstance().m_Framelimit - 1) * 5 : VideoInterface::TargetRefreshRate;
 
+	static bool isUnthrottling = false;
+	static bool wasVSync = g_ActiveConfig.bVSync;
+
+	// Disable vsync while holding tab to disable the frame limit.
+	if (Host_GetKeyState('\t'))
+	{
+		if (!isUnthrottling)
+			wasVSync = g_ActiveConfig.bVSync;
+		if (g_ActiveConfig.bVSync)
+			g_Config.bVSync = false;
+		isUnthrottling = true;
+	}
+	else if (isUnthrottling)
+	{
+		isUnthrottling = false;
+		if (wasVSync)
+			g_Config.bVSync = true;
+	}
+
 	// Disable the frame-limiter when the throttle (Tab) key is held down. Audio throttle: m_Framelimit = 2
 	if (SConfig::GetInstance().m_Framelimit && SConfig::GetInstance().m_Framelimit != 2 && !Host_GetKeyState('\t'))
 	{
@@ -654,7 +675,6 @@ void Callback_VideoCopiedToXFB(bool video_update)
 {
 	if(video_update)
 		Common::AtomicIncrement(DrawnFrame);
-	Movie::FrameUpdate();
 }
 
 // Callback_ISOName: Let the DSP emulator get the game name