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

1 files changed, 6 insertions, 0 deletions

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);
                         }