fixed SD-1833 - Method Insight popup exceeds screen

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/CodeCompletion/CompletionWindowBase.cs

@@ -308,7 +308,11 @@ namespace ICSharpCode.AvalonEdit.CodeCompletion
 			UpdatePosition();
 		}
 		
-		void UpdatePosition()
+		/// <summary>
+		/// Updates the position of the CompletionWindow based on the parent TextView position and the screen working area.
+		/// It ensures that the CompletionWindow is completely visible on the screen.
+		/// </summary>
+		protected void UpdatePosition()
 		{
 			TextView textView = this.TextArea.TextView;
 			// PointToScreen returns device dependent units (physical pixels)

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/CodeCompletion/InsightWindow.cs

@@ -29,9 +29,16 @@ namespace ICSharpCode.AvalonEdit.CodeCompletion
 		{
 			this.CloseAutomatically = true;
 			AttachEvents();
+		}
+		
+		/// <inheritdoc/>
+		protected override void OnSourceInitialized(EventArgs e)
+		{
+			base.OnSourceInitialized(e);
 			
 			Rect caret = this.TextArea.Caret.CalculateCaretRectangle();
-			Rect workingArea = System.Windows.Forms.Screen.FromPoint(caret.Location.ToSystemDrawing()).WorkingArea.ToWpf();
+			Point pointOnScreen = this.TextArea.TextView.PointToScreen(caret.Location - this.TextArea.TextView.ScrollOffset);
+			Rect workingArea = System.Windows.Forms.Screen.FromPoint(pointOnScreen.ToSystemDrawing()).WorkingArea.ToWpf().TransformFromDevice(this);
 			
 			MaxHeight = workingArea.Height;
 			MaxWidth = Math.Min(workingArea.Width, Math.Max(1000, workingArea.Width * 0.6));

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/CodeCompletion/OverloadInsightWindow.cs

@@ -48,6 +48,10 @@ namespace ICSharpCode.AvalonEdit.CodeCompletion
 						overloadViewer.ChangeIndex(+1);
 						break;
 				}
+				if (e.Handled) {
+					UpdateLayout();
+					UpdatePosition();
+				}
 			}
 		}
 	}