Re: show-paren-mode prevents page-down from displaying next 1/2 page.

[Richard Stallman]

    To setup this rather strange bug, you need to:
       1. ensure show-paren-mode is enabled
       2. create a buffer and in that buffer, half way down the window,
          create a line that has some [] brackets such that the ] bracket
          is the last displayed character on the right of the screen.

          I also had characters after the ] so that the right hand "fringe"
          displayed its wrap-around icon.

          It is important that the [] line is displayed half way down the 
window, e.g on the 5th line on a window height of 10 (9 lines displayed due to 
wrap around).

       3. place point anywhere on the line with [] brackets and press the 
page-down key.

    Instead of paging down, the display will flash and place point immediately 
after the ] bracket.

Can you send us a _precise_ test case for this bug?
Please read the Bugs section in the Emacs manual, which provides
guidelines on how to write a bug report to give us the
necessary information so we can fix the bug.