Fixed SD2-547: Incorrect text line selected after scrolling text editor window

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@711 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Libraries/ICSharpCode.TextEditor/Project/Src/Gui/TextView.cs

@@ -723,8 +723,8 @@ namespace ICSharpCode.TextEditor
 		/// </summary>
 		public int GetLogicalLine(Point mousepos)
 		{
-			int physicalLine = FirstPhysicalLine + (int)(mousepos.Y / FontHeight);
-			return Document.GetFirstLogicalLine(physicalLine);
+			int clickedVisualLine = Math.Max(0, (mousepos.Y + this.textArea.VirtualTop.Y) / fontHeight);
+			return Document.GetFirstLogicalLine(clickedVisualLine);
 		}
 		
 		public Point GetLogicalColumn(int firstLogicalLine, int xPos)