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Gdk.Rectangle rect = valueTree.GetCellArea (path, col);
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if (!mousePressed && valueTree.Columns[0] == col && cx >= rect.Left) {
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// Gdk.Pointer.Grab (this.GdkWindow, true, Gdk.EventMask.ButtonPressMask | Gdk.EventMask.ButtonReleaseMask | Gdk.EventMask.PointerMotionMask | Gdk.EventMask.EnterNotifyMask | Gdk.EventMask.LeaveNotifyMask, null, null, Gtk.Global.CurrentEventTime);