Responding to Copilot's comments

Author: jtmaxwell3

Src/LexText/Interlinear/FocusBoxController.cs

@@ -47,7 +47,7 @@ internal bool IsDirty
 			get { return m_sandbox.IsDirty; }
 		}
 
-		private bool suppressFocusChange = false;
+		private bool m_suppressFocusChange = false;
 
 		// There is no logical reason for other buttons ever to get the focus. But .NET helpfully focuses the link words button
 		// as we hide the focus box. And in some other circumstance, which I can't even figure out, it focuses the menu button.
@@ -265,7 +265,7 @@ internal void AdjustSizeAndLocationForControls(bool fAdjustOverallSize)
 			}
 			finally
 			{
-				if (!suppressFocusChange)
+				if (!m_suppressFocusChange)
 				{
 					Focus();
 				}
@@ -317,15 +317,20 @@ public virtual void SelectOccurrence(AnalysisOccurrence selected)
 
 		public void UpdateField(int hvo, int flid)
 		{
+			if (IsDisposed || m_sandbox == null)
+			{
+				return;
+			}
+
 			try
 			{
 				// This fixes LT-22539.
-				suppressFocusChange = true;
+				m_suppressFocusChange = true;
 				m_sandbox.UpdateField(hvo, flid);
 			}
 			finally
 			{
-				suppressFocusChange = false;
+				m_suppressFocusChange = false;
 			}
 		}
 

Src/LexText/Interlinear/InterlinDocForAnalysis.Designer.cs

@@ -1658,9 +1658,15 @@ private int CreateSecondaryAndCopyStrings(int flidChoices, int hvoMain, int flid
 
 		public void UpdateField(int hvo, int flid)
 		{
+			CheckDisposed();
+			if (!m_cache.ServiceLocator.IsValidObjectId(hvo))
+			{
+				return;
+			}
 			ICmObject hvoObject = Caches.MainCache.ServiceLocator.GetInstance<ICmObjectRepository>().GetObject(hvo);
 			if (hvoObject is ILexSense lexSense && lexSense.Owner is ILexEntry lexEntry)
 			{
+				// This lex sense changed.  Update morphs that use it.
 				foreach (int hvoMorph in GetHvoMorphsForLexSense(hvo))
 				{
 					// This fixes LT-22534.
@@ -1675,6 +1681,7 @@ public void UpdateField(int hvo, int flid)
 					{
 						if (sense.MorphoSyntaxAnalysisRA == msa)
 						{
+							// This lex sense changed.  Update morphs that use it.
 							foreach (int hvoMorph in GetHvoMorphsForLexSense(sense.Hvo))
 							{
 								// This fixes LT-22541.