enhance bookmark tooltips: allow breakpoint tooltip to be displayed even if CurrentLineBookmark is on the same line.

src/AddIns/Debugger/Debugger.AddIn/Breakpoints/BreakpointBookmark.cs

@@ -152,6 +152,10 @@ namespace Debugger.AddIn.Breakpoints
 			return string.Format("{0} @{1}", this.FileName, this.LineNumber);
 		}
 		
+		public override bool DisplaysTooltip {
+			get { return true; }
+		}
+		
 		public override object CreateTooltipContent()
 		{
 			return new BreakpointEditorPopup(this) {

src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/IconBarMargin.cs

@@ -19,6 +19,7 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
+using System.Linq;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Controls.Primitives;
@@ -286,7 +287,10 @@ namespace ICSharpCode.AvalonEdit.AddIn
 			
 			int line = GetLineFromMousePosition(e);
 			if (line < 1) return;
-			IBookmark bm = GetBookmarkFromLine(line);
+			IBookmark bm = manager.Bookmarks
+				.Where(m => m.LineNumber == line && m.DisplaysTooltip)
+				.OrderBy(m => m.ZOrder)
+				.FirstOrDefault();
 			if (bm == null) return;
 			object content = bm.CreateTooltipContent();
 			popupToolTip = content as Popup;
@@ -301,7 +305,7 @@ namespace ICSharpCode.AvalonEdit.AddIn
 				e.Handled = true;
 				popupToolTip.IsOpen = true;
 				distanceToPopupLimit = double.PositiveInfinity; // reset limit; we'll re-calculate it on the next mouse movement
-			} else {
+			} else if (content != null) {
 				if (toolTip == null) {
 					toolTip = new ToolTip();
 					toolTip.Closed += ToolTipClosed;

src/Main/Base/Project/Editor/Bookmarks/BookmarkBase.cs

@@ -195,6 +195,10 @@ namespace ICSharpCode.SharpDevelop.Editor.Bookmarks
 		{
 		}
 		
+		public virtual bool DisplaysTooltip {
+			get { return false; }
+		}
+		
 		public virtual object CreateTooltipContent()
 		{
 			return null;

src/Main/Base/Project/Editor/Bookmarks/EntityBookmark.cs

@@ -98,6 +98,10 @@ namespace ICSharpCode.SharpDevelop.Editor.Bookmarks
 			throw new NotSupportedException();
 		}
 		
+		bool IBookmark.DisplaysTooltip {
+			get { return false; }
+		}
+		
 		object IBookmark.CreateTooltipContent()
 		{
 			return null;

src/Main/Base/Project/Editor/Bookmarks/IBookmark.cs

@@ -61,6 +61,11 @@ namespace ICSharpCode.SharpDevelop.Editor.Bookmarks
 		/// </summary>
 		void Drop(int lineNumber);
 		
+		/// <summary>
+		/// Gets whether this bookmark might want to display a tooltip.
+		/// </summary>
+		bool DisplaysTooltip { get; }
+		
 		/// <summary>
 		/// Creates the tooltip content for the bookmark.
 		/// </summary>