REPORT-30352 在文本域的init方法里添加setMargin()

designer-base/src/main/java/com/fr/design/gui/syntax/ui/rtextarea/RTextAreaBase.java

@@ -645,6 +645,7 @@ int currentCaretY;							// Used to know when to rehighlight current line.
 		setTabsEmulated(false);
 
 		// Stuff needed by the caret listener below.
+		setMargin(getInsets());
 		previousCaretY = currentCaretY = getInsets().top;
 
 		// Stuff to highlight the current line.