diff --git a/uppsrc/CtrlCore/Ctrl.cpp b/uppsrc/CtrlCore/Ctrl.cpp
index 4207edf16..80cefea74 100644
--- a/uppsrc/CtrlCore/Ctrl.cpp
+++ b/uppsrc/CtrlCore/Ctrl.cpp
@@ -29,6 +29,7 @@ bool (*&DisplayErrorFn())(const Value& v)
 }
 
 int64 Ctrl::eventid;
+int   Ctrl::EventLevel;
 
 Ctrl *Ctrl::LoopCtrl;
 int   Ctrl::LoopLevel;
diff --git a/uppsrc/CtrlCore/CtrlCore.h b/uppsrc/CtrlCore/CtrlCore.h
index 194317ac5..134fad2cf 100644
--- a/uppsrc/CtrlCore/CtrlCore.h
+++ b/uppsrc/CtrlCore/CtrlCore.h
@@ -534,6 +534,7 @@ private:
 	static  bool      globalbackpaint;
 	static  bool      globalbackbuffer;
 	static  bool      painting;
+	static  int       EventLevel;
 	static  int       LoopLevel;
 	static  Ctrl     *LoopCtrl;
 	static  int64     EventLoopNo;
@@ -729,6 +730,11 @@ private:
 	static void InstallPanicBox();
 	
 	bool IsDHCtrl() const;
+	
+	struct EventLevelDo {
+		EventLevelDo() { EventLevel++; };
+		~EventLevelDo() { EventLevel--; };
+	};
 
 private:
 			void    DoRemove();
@@ -1214,9 +1220,11 @@ public:
 	static bool IsWaitingEvent();
 	static bool ProcessEvent(bool *quit = NULL);
 	static bool ProcessEvents(bool *quit = NULL);
+	static int  GetEventLevel()     { return EventLevel; }
 
 	bool   IsPopUp() const          { return popup; }
 
+
 	static void  EventLoop(Ctrl *loopctrl = NULL);
 	static int   GetLoopLevel()     { return LoopLevel; }
 	static Ctrl *GetLoopCtrl()      { return LoopCtrl; }
diff --git a/uppsrc/CtrlCore/CtrlKbd.cpp b/uppsrc/CtrlCore/CtrlKbd.cpp
index 2044c4721..aa64c3c75 100644
--- a/uppsrc/CtrlCore/CtrlKbd.cpp
+++ b/uppsrc/CtrlCore/CtrlKbd.cpp
@@ -38,6 +38,7 @@ void Ctrl::RefreshAccessKeysDo(bool vis)
 bool Ctrl::DispatchKey(dword keycode, int count)
 {
 	GuiLock __;
+	EventLevelDo ___;
 	if(GUI_AltAccessKeys()) {
 		bool alt = GetAlt();
 		Ctrl *c = GetActiveCtrl();
diff --git a/uppsrc/CtrlCore/CtrlMouse.cpp b/uppsrc/CtrlCore/CtrlMouse.cpp
index 0cd81fa70..ac7fce29e 100644
--- a/uppsrc/CtrlCore/CtrlMouse.cpp
+++ b/uppsrc/CtrlCore/CtrlMouse.cpp
@@ -524,6 +524,7 @@ bool sDblTime(int time)
 
 Image Ctrl::DispatchMouse(int e, Point p, int zd) {
 	GuiLock __;
+	EventLevelDo ___;
 	if(e == MOUSEWHEEL && !zd) // ignore non-scroll wheel events
 		return Null;
 	if(e == MOUSEMOVE && repeatTopCtrl == this) {
diff --git a/uppsrc/CtrlCore/src.tpp/Ctrl_en-us.tpp b/uppsrc/CtrlCore/src.tpp/Ctrl_en-us.tpp
index 8ea9a143b..acea6148d 100644
--- a/uppsrc/CtrlCore/src.tpp/Ctrl_en-us.tpp
+++ b/uppsrc/CtrlCore/src.tpp/Ctrl_en-us.tpp
@@ -2423,6 +2423,16 @@ intercepted (Win32 specific).&]
 were processed, false that queue was empty.&]
 [s3;%- &]
 [s4;%- &]
+[s5;:Upp`:`:Ctrl`:`:GetEventLevel`(`):%- [@(0.0.255) static] [@(0.0.255) int]_[* GetEventLe
+vel]()&]
+[s2; Returns the level of input event. This is basically a reentrancy 
+level of ProcessEvent(s) routine `- it starts zero but increments 
+each time the input event is generated by ProcessEvent(s). This 
+information can be useful for background threads or in timer 
+events (where this is zero when application is in the `"base`" 
+state).&]
+[s3;%- &]
+[s4;%- &]
 [s5;:Ctrl`:`:IsPopUp`(`)const:%- [@(0.0.255) bool]_[* IsPopUp]()_[@(0.0.255) const]&]
 [s7;i1120;a17; [*/ Return value]-|True if Ctrl is pop`-up window.&]
 [s3; &]
diff --git a/uppsrc/GLDraw/Text.cpp b/uppsrc/GLDraw/Text.cpp
index 826dc69a5..b90a6cfbe 100644
--- a/uppsrc/GLDraw/Text.cpp
+++ b/uppsrc/GLDraw/Text.cpp
@@ -69,7 +69,7 @@ void GLDrawText(const GLContext2D& dd, Pointf pos, double angle, const wchar *te
 	if(angle)
 		u = Polar(-angle);
 	if(n < 0)
-		n = wstrlen(text);
+		n = strlen__(text);
 	for(int i = 0; i < n; i++) {
 		GLTexture m = GetGlyphGLTextureCached(-angle, text[i], font, ink);
 		Point h = m.GetHotSpot();
diff --git a/uppsrc/ide/ide.cpp b/uppsrc/ide/ide.cpp
index 57e94d22d..01b5b6bd0 100644
--- a/uppsrc/ide/ide.cpp
+++ b/uppsrc/ide/ide.cpp
@@ -645,10 +645,8 @@ void Ide::Periodic()
 	SetIcon();
 	if(debugger && debugger->IsFinished() && !IdeIsDebugLock())
 		IdeEndDebug();
-	if(file_scanned) {
-		if(EditFileAssistSync2())
-			file_scanned = false;
-	}
+	if(file_scanned && Ctrl::GetEventLevel() == 0 && EditFileAssistSync2())
+		file_scanned = false;
 }
 
 const Workspace& Ide::IdeWorkspace() const
diff --git a/uppsrc/ide/idefile.cpp b/uppsrc/ide/idefile.cpp
index 69461d186..2edb4a6db 100644
--- a/uppsrc/ide/idefile.cpp
+++ b/uppsrc/ide/idefile.cpp
@@ -686,7 +686,7 @@ void Ide::TriggerAssistSync()
 				String s = ~editor;
 				String fn = editfile;
 				file_scan++;
-				if(!CoWork::TrySchedule([=] {
+				if(Ctrl::GetEventLevel() == 0 && !CoWork::TrySchedule([=] {
 					StringStream ss(s);
 					file_scanned = TryCodeBaseScanFile(ss, editfile);
 					file_scan--;