OWPythonScript: keep undo history after file drops

Author: markotoplak

Orange/widgets/data/owpythonscript.py

@@ -194,14 +194,13 @@ def pasteFile(self, url):
                 replace = dialog_replace_append(filename)
             if replace is None:  # cancel
                 return
-            if replace:  # replace
-                self.document().setPlainText(new)
+            cursor = QTextCursor(self.document())
+            if replace:
+                cursor.select(QTextCursor.Document)
+                cursor.insertText(new)
             else:  # append
-                self.document().setPlainText(
-                    current_text +
-                    ("\n" if not current_text.endswith("\n") else "") +
-                    new)
-            self.document().setModified(True)
+                cursor.movePosition(QTextCursor.End)
+                cursor.insertText(new)
 
 
 class PythonConsole(QPlainTextEdit, code.InteractiveConsole):