Why does dropdown comes in "Rev" when we edit published app?

Question

I have published an app and editing it. One new "Rev" tab is created and it is giving me a dropdown as shown here. Why it is being created here? It is not created in any other Stack Exchange websites when we edit question. Is it related to

<!-- version: 0.0 -->

as explained here: How to list your application/library/wrapper/script here?

Answer 1

This is either a bug or an incomplete feature. See:

• What is the 'rev' dropdown supposed to do?
• Stack Exchange Revisions Dropdown Does Nothing?

This extra dropdown seems to require:

1. That the post have had previous edits.

2. That the page mode editor is invoked.

   1. This editor is the default for low-rep users under at least some conditions. (low rep still being less than 2000, best I can tell).
   2. High-rep users can invoke this editor by control-clicking on the edit link.
      
      

3. The presence of the <!-- version: 0.0 --> comment makes no difference.

4. _{Replicating this is a little flaky for me. There might be another factor involved.}