Bug ID: 61937
           Summary: Auto scrolling badly breaks when writing "over the
                    edge" (end of page)
           Product: MediaWiki extensions
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: major
          Priority: Unprioritized
         Component: Flow
       Web browser: ---
   Mobile Platform: ---

There seems to be a major bug with auto scrolling that starts when one is
writing "over the edge" of the currently visible browser viewport.

Steps to reproduce:
- Visit a permalink of a topic (problem might be exclusive to topics as I can't
reproduce it right now on a whole board)
- Click "Reply" or the reply box at the bottom
- Now start entering blank lines (just keep repeatedly pushing the enter key)
- At some point the lower edge of the input field reaches the bottom of the
currently visible browser viewport
- Keep entering newlines (or maybe also some text from time to time to be able
to better observe the problem)

Expected behaviour:
- Flow should keep the active line (therefore the last line if you followed the
steps above) in sight, therefore at the bottom of the page.

Actual behaviour:
- At some point (soon after reaching the original end of the page) the
automatic scrolling goes totally crazy.
- It starts with the text jumping around by some pixels every time one is
entering a character
- Soon after the whole page is jumping around by multiple lines whenever
entering a character
- the active line is only quickly in the visible browser viewport when entering
the character; quickly after the viewport is jumping back up the page and the
active line is hidden.

The above occurs for me on Windows 7 using Firefox 27.0.1

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