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bug#15841: Display bugs with cache-long-lines non-nil


From: Eli Zaretskii
Subject: bug#15841: Display bugs with cache-long-lines non-nil
Date: Sat, 09 Nov 2013 16:02:21 +0200

> Date: Sat, 09 Nov 2013 13:18:29 +0200
> From: Eli Zaretskii <address@hidden>
> Cc: address@hidden, address@hidden
> 
>  emacs -Q --eval "(setq-default cache-long-scans nil)"
>  C-x C-f src/xdisp.c
>  M-: (setq cache-long-scans t) RET
>  M-x linum-mode RET
>  M->
> 
> Many line numbers near the end of the buffer are not shown in the
> margin.

This seems to be related to font-lock: turning off
global-font-lock-mode makes the problems go away.  Manually invoking
font-lock-fontify-buffer before turning on linum-mode also eliminates
the problems, so it looks like JIT Font Lock is the prime suspect.





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