Try to tack down in-cell click location bug

Author: govert

Source/ExcelDna.IntelliSense/ToolTipForm.cs

@@ -59,8 +59,7 @@ public ToolTipForm(IntPtr hwndOwner)
                 { FontStyle.Bold | FontStyle.Italic, new Font("Segoe UI", 9, FontStyle.Bold | FontStyle.Italic) },
 
             };
-            // Color.FromArgb(68, 68, 68) Best matches Excel's built-in color, but I think a bit too light
-            _textColor = Color.FromArgb(68, 68, 68);
+            _textColor = Color.FromArgb(72, 72, 72);
             _linkColor = Color.Blue;
             _borderPen = new Pen(Color.FromArgb(195, 195, 195));
             _borderLightPen = new Pen(Color.FromArgb(225, 225, 225));

Source/ExcelDna.IntelliSense/UIMonitor/WinEvents.cs

@@ -172,7 +172,8 @@ void OnWinEventReceived(object winEventArgsObj)
         {
             var winEventArgs = (WinEventArgs)winEventArgsObj;
 #if DEBUG
-            Logger.WinEvents.Verbose($"{winEventArgs.EventType} - Window {winEventArgs.WindowHandle:X} ({Win32Helper.GetClassName(winEventArgs.WindowHandle)} - Object/Child {winEventArgs.ObjectId} / {winEventArgs.ChildId} - Thread {winEventArgs.EventThreadId} at {winEventArgs.EventTimeMs}");
+            if (winEventArgs.ObjectId != WinEventObjectId.OBJID_CURSOR)
+                Logger.WinEvents.Verbose($"{winEventArgs.EventType} - Window {winEventArgs.WindowHandle:X} ({Win32Helper.GetClassName(winEventArgs.WindowHandle)} - Object/Child {winEventArgs.ObjectId} / {winEventArgs.ChildId} - Thread {winEventArgs.EventThreadId} at {winEventArgs.EventTimeMs}");
 #endif
             WinEventReceived?.Invoke(this, winEventArgs);
         }

Source/ExcelDna.IntelliSense/UIMonitor/WindowWatcher.cs

@@ -72,7 +72,8 @@ internal WindowChangedEventArgs(IntPtr windowHandle, WinEventHook.WinEvent winEv
                         Type = ChangeType.LocationChange;
                         break;
                     default:
-                        throw new ArgumentException("Unexpected WinEvent type", nameof(winEvent));
+                        // throw new ArgumentException("Unexpected WinEvent type", nameof(winEvent));
+                        break;
                 }
                 switch (objectId)
                 {
@@ -86,7 +87,7 @@ internal WindowChangedEventArgs(IntPtr windowHandle, WinEventHook.WinEvent winEv
                         ObjectId = ChangeObjectId.Caret;
                         break;
                     default:
-                        Debug.Fail("Unexpected ObjectId");
+                        //Debug.Fail("Unexpected ObjectId");
                         ObjectId = ChangeObjectId.Unknown;
                         break;
                 }

Source/ExcelDna.IntelliSense/UIMonitor/XlCall.cs

@@ -64,12 +64,12 @@ public static string GetFormulaEditPrefix()
                 }
                 if (fmlaInfo.wPointMode == xlModeReady)
                 {
-                    // Logger.WindowWatcher.Verbose($"LPenHelper PointMode Ready");
+                    Logger.WindowWatcher.Verbose($"LPenHelper PointMode Ready");
                     return null;
                 }
 
-                //Logger.WindowWatcher.Verbose("LPenHelper Status: PointMode: {0}, Formula: {1}, First: {2}, Last: {3}, Caret: {4}",
-                //    fmlaInfo.wPointMode, Marshal.PtrToStringUni(fmlaInfo.lpch, fmlaInfo.cch), fmlaInfo.ichFirst, fmlaInfo.ichLast, fmlaInfo.ichCaret);
+                Logger.WindowWatcher.Verbose("LPenHelper Status: PointMode: {0}, Formula: {1}, First: {2}, Last: {3}, Caret: {4}",
+                    fmlaInfo.wPointMode, Marshal.PtrToStringUni(fmlaInfo.lpch, fmlaInfo.cch), fmlaInfo.ichFirst, fmlaInfo.ichLast, fmlaInfo.ichCaret);
 
                 var prefixLen = Math.Min(Math.Max(fmlaInfo.ichCaret, fmlaInfo.ichLast), fmlaInfo.cch);  // I've never seen ichLast > cch !?
                 return Marshal.PtrToStringUni(fmlaInfo.lpch, prefixLen);