From 1c3745cdf89ec4b171e3dd8bc8ccd97b0cd7dfcc Mon Sep 17 00:00:00 2001
From: modmuss
Date: Thu, 28 Mar 2024 18:43:48 +0000
Subject: Clear undo history when updating editor text. (#540)

We don't care about the undo/redo history of the syntax pane, any change history would be stored separately---
 .../src/main/java/cuchaz/enigma/gui/panels/EditorPanel.java         | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/enigma-swing/src/main/java/cuchaz/enigma/gui/panels/EditorPanel.java b/enigma-swing/src/main/java/cuchaz/enigma/gui/panels/EditorPanel.java
index b285689e..e0a299f5 100644
--- a/enigma-swing/src/main/java/cuchaz/enigma/gui/panels/EditorPanel.java
+++ b/enigma-swing/src/main/java/cuchaz/enigma/gui/panels/EditorPanel.java
@@ -35,6 +35,7 @@ import javax.swing.text.Document;
 import javax.swing.text.Highlighter.HighlightPainter;
 
 import de.sciss.syntaxpane.DefaultSyntaxKit;
+import de.sciss.syntaxpane.SyntaxDocument;
 
 import cuchaz.enigma.EnigmaProject;
 import cuchaz.enigma.analysis.EntryReference;
@@ -504,6 +505,11 @@ public class EditorPanel {
 			this.editor.getHighlighter().removeAllHighlights();
 			this.editor.setText(source.toString());
 
+			// We don't care about the undo/redo history of the syntax pane, any change history would be stored separately
+			if (this.editor.getDocument() instanceof SyntaxDocument syntaxDocument) {
+				syntaxDocument.clearUndos();
+			}
+
 			if (this.source != null) {
 				this.editor.setCaretPosition(newCaretPos);
 			}
-- 
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