Why is there blank space where there ought be line numbers in Emacs?

问题

I'm using (global-linum-mode t) to present line numbers in Emacs. This works just fine up-until I use the ctrl + up/down commands (forward-paragraph and backward-paragraph) to navigate a buffer, at which point some line numbers are rendered incorrectly (see attached image). This occurs only when I use said commands to skip entire segments of code, and the issue immediately disappears (the line numbers are rendered correctly, that is) if I start navigating the buffer by other means. The issue is present in both C and C++ modes (visualized), and I'm using Emacs 24.3.1 on x86-64 Fedora 19.

While the go-to-line command serves my purposes in terms of navigating compilation errors and warnings, I'd like to keep the line numbers as I find them to be helpful in terms of quickly approximating length of functions. So far I've found no mention of this problem elsewhere, and I'm unsure of whether or not this is expected behavior of Emacs or if I'm to submit a bug report.

Has anyone encountered the issue or know anything of its origin?

---

Fix:

The problem may be resolved by invoking (linum-update-current), as portrayed by @lawlist in his answer below. An easy way of repeatedly doing this is to append the command to the execution of forward-paragraph, which may be done using the Emacs Lisp advice feature:

(defadvice forward-paragraph (after forward-paragraph-linum-update)
  "Perform (linum-update-current) after jumping forward one
  paragraph to ensure line numbers are being rendered
  correctly."
  (linum-update-current))
(ad-activate 'forward-paragraph)

回答1:

A few of the lead members on the Emacs development team suggest that linum-mode be avoided for a variety of reasons, and instead they suggest using nlinum-mode: http://elpa.gnu.org/packages/nlinum.html

I personally use a modified version of linum-mode, and I have fixed a few bugs -- if you keep using linum-mode, you will likely need to do the same -- i.e., implement your own bug fixes as you find them. The quickest way to fix the bug you see is to follow your command with:

(linum-update-current)

来源：https://stackoverflow.com/questions/25078910/why-is-there-blank-space-where-there-ought-be-line-numbers-in-emacs