PDFBOX-5660: refactor, avoid leaking this in constructor

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1934045 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

debugger/src/main/java/org/apache/pdfbox/debugger/PDFDebugger.java

@@ -1064,6 +1064,7 @@ private void showPage(Object selectedNode)
             if (COSName.PAGE.equals(typeItem))
             {
                 PagePane pagePane = new PagePane(document, page, statusBar.getStatusLabel());
+                pagePane.init();
                 replaceRightComponent(new JScrollPane(pagePane.getPanel()));
             }
         }

debugger/src/main/java/org/apache/pdfbox/debugger/pagepane/PagePane.java

@@ -120,6 +120,13 @@ public PagePane(PDDocument document, COSDictionary pageDict, JLabel statuslabel)
         pageIndex = document.getPages().indexOf(page);
         this.document = document;
         this.statuslabel = statuslabel;
+    }
+
+    /**
+     * Initialization, to be called immediately after construction.
+     */
+    public void init()
+    {
         initUI();
         initRectMap();
     }