diff --git a/uppsrc/CtrlCore/X11Top.cpp b/uppsrc/CtrlCore/X11Top.cpp
index 9cac72893..cf23aa31e 100644
--- a/uppsrc/CtrlCore/X11Top.cpp
+++ b/uppsrc/CtrlCore/X11Top.cpp
@@ -251,7 +251,7 @@ void TopWindow::CenterRect(Ctrl *owner)
 			r = wr;
 		Point p = r.CenterPos(sz);
 		
-		if ((p.x + sz.cx <= wr.Width() + wr.left) && (p.y + sz.cy <= wr.Height() + wr.top)) {
+		if (GetVirtualScreenArea().Contains(p)) {
 			r = RectC(p.x, p.y, sz.cx, sz.cy);
 			wr.left += fm.left;
 			wr.right -= fm.right;
diff --git a/uppsrc/TextDiffCtrl/TextCtrl.cpp b/uppsrc/TextDiffCtrl/TextCtrl.cpp
index 97bb461d0..47155110e 100644
--- a/uppsrc/TextDiffCtrl/TextCtrl.cpp
+++ b/uppsrc/TextDiffCtrl/TextCtrl.cpp
@@ -60,6 +60,11 @@ void TextCompareCtrl::LeftDown(Point pt, dword keyflags)
 	SetWantFocus();
 }
 
+void TextCompareCtrl::LeftDouble(Point pt, dword keyflags)
+{
+	
+}
+
 void TextCompareCtrl::MouseMove(Point pt, dword flags)
 {
 	if(HasCapture())
diff --git a/uppsrc/TextDiffCtrl/TextDiffCtrl.h b/uppsrc/TextDiffCtrl/TextDiffCtrl.h
index a70da2619..9c7a393db 100644
--- a/uppsrc/TextDiffCtrl/TextDiffCtrl.h
+++ b/uppsrc/TextDiffCtrl/TextDiffCtrl.h
@@ -35,6 +35,7 @@ public:
 	virtual void   MouseWheel(Point pt, int zdelta, dword keyflags);
 	virtual void   MouseMove(Point pt, dword keyflags);
 	virtual void   LeftDown(Point pt, dword keyflags);
+	virtual void   LeftDouble(Point pt, dword keyflags);
 	virtual void   LeftUp(Point pt, dword keyflags);
 	virtual void   RightDown(Point p, dword keyflags);
 	virtual bool   Key(dword key, int repcnt);
@@ -78,6 +79,7 @@ private:
 
 public:
 	Callback       WhenScroll;
+	Callback       WhenLeftDouble;
 
 	void           SetCount(int c);
 	void           AddCount(int c);