From 545597722a7fa4de7a1c8ea48cc3f8953b0ebcbb Mon Sep 17 00:00:00 2001
From: Jonah Graham <jonah@kichwacoders.com>
Date: Sun, 6 Sep 2020 21:47:23 -0400
Subject: [PATCH] Bug 566713: Fix Widget Disposed exception with asyncExec

Change-Id: I37620534ec5c88da4acaa6e0a2cc789347a8d8d5
---
 .../settings/providers/LanguageSettingsEntriesTab.java        | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/language/settings/providers/LanguageSettingsEntriesTab.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/language/settings/providers/LanguageSettingsEntriesTab.java
index d1641995898..029214af4d5 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/language/settings/providers/LanguageSettingsEntriesTab.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/language/settings/providers/LanguageSettingsEntriesTab.java
@@ -390,7 +390,9 @@ public class LanguageSettingsEntriesTab extends AbstractCPropertyTab {
 			@Override
 			public void treeExpanded(TreeEvent e) {
 				treeEntries.getDisplay().asyncExec(() -> {
-					treeCol.pack();
+					if (!treeCol.isDisposed()) {
+						treeCol.pack();
+					}
 				});
 			}
 		});