From 9515786e802f59563010d395caa90260bb65e95b Mon Sep 17 00:00:00 2001
From: Mickael Istria <mistria@redhat.com>
Date: Wed, 29 Mar 2023 17:15:54 +0200
Subject: [PATCH] Call getLineCount in UI Thread

Fixes https://github.com/eclipse-platform/eclipse.platform.text/issues/172
---
 .../jface/text/source/AnnotationRulerColumn.java       | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/org.eclipse.jface.text/src/org/eclipse/jface/text/source/AnnotationRulerColumn.java b/org.eclipse.jface.text/src/org/eclipse/jface/text/source/AnnotationRulerColumn.java
index 106a6fb1b..57fed27d8 100644
--- a/org.eclipse.jface.text/src/org/eclipse/jface/text/source/AnnotationRulerColumn.java
+++ b/org.eclipse.jface.text/src/org/eclipse/jface/text/source/AnnotationRulerColumn.java
@@ -191,10 +191,12 @@ public int compare(Tuple o1, Tuple o2) {
 
 		@Override
 		public void textChanged(TextEvent event) {
-			if (event.getViewerRedrawState() && fCachedTextWidget.getLineCount() != previousLineCount) {
-				previousLineCount= fCachedTextWidget.getLineCount();
-				postRedraw();
-			}
+			fCachedTextWidget.getDisplay().execute(() -> {
+				if (event.getViewerRedrawState() && fCachedTextWidget.getLineCount() != previousLineCount) {
+					previousLineCount= fCachedTextWidget.getLineCount();
+					postRedraw();
+				}
+			});
 		}
 	};