2nd tag saving problem fixed

src/com/jpexs/decompiler/flash/SWF.java

@@ -451,6 +451,7 @@ public final class SWF implements TreeItem, Timelined {
     public void clearModified() {
         for (Tag tag : tags) {
             if (tag.isModified()) {
+                tag.createOriginalData();
                 tag.setModified(false);
             }
         }

src/com/jpexs/decompiler/flash/tags/Tag.java

@@ -68,7 +68,7 @@ public abstract class Tag implements NeedsCharacters, Exportable, ContainerItem,
      * Original tag data
      */
     @Internal
-    private final ByteArrayRange originalData;
+    private ByteArrayRange originalData;
 
     public String getTagName() {
         return tagName;
@@ -394,6 +394,15 @@ public abstract class Tag implements NeedsCharacters, Exportable, ContainerItem,
         modified = value;
     }
 
+    public void createOriginalData() {
+        byte[] data = getData();
+        byte[] headerData = getHeader(data);
+        byte[] tagData = new byte[data.length + headerData.length];
+        System.arraycopy(headerData, 0, tagData, 0, headerData.length);
+        System.arraycopy(data, 0, tagData, headerData.length, data.length);
+        originalData = new ByteArrayRange(tagData, 0, tagData.length);
+    }
+
     public boolean isModified() {
         return modified;
     }