public String getHistory() {
		try {
			return doc.getText(0, doc.getLength());
		}
		catch (BadLocationException e) {
			Msg.error(this, "This should never happen as the indexes came from the document!");
			return "";
		}
	}
Show the comment history
@param program program
@param addr address of comment history
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/comments/CommentHistoryPanel.java