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how to remove the red area that i think related to trailing spaces

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    Don't unconditionally enable show-trailing-whitespace everywhere. It doesn't make any sense in buffers derived from special-mode because those aren't text you're supposed to edit. – wasamasa Jul 25 '18 at 19:44
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This should do the trick:

(add-hook 'calendar-mode-hook (function (lambda () (setq show-trailing-whitespace nil))))

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CAVEAT:  Deleting the trailing whitespace may have unintended consequences; e.g., there might be a function somewhere containing a regexp to locate a date and that regexp might include trailing spaces "[0-9]+\s+". If a problem arises, it will be necessary to either remove this advice or deal with the functions that are at issue. Your mileage with this advice may vary.

(defun my-function (month year indent)
    (delete-trailing-whitespace))

(advice-add 'calendar-generate-month :after 'my-function)
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    Is the problem here not that whitespace-mode is enabled for the popup (quite possibly globally)? Just turning that off should fix the problem without having to modify the contents. – rpluim Jul 25 '18 at 15:25
  • @RobertPluim -- While it is true that disabling whitespace-mode in calendar-mode buffers would make the trailing whitespace invisible to the human eye, it boils down to personal taste. whitespace-mode makes some people "happy". :) I have modified several default functions in my own custom setup because I personally cannot live with one or more final new-lines in things like dired-mode and so forth. – lawlist Jul 25 '18 at 18:44
  • I was not recommending turning it off completely, just for buffers in calendar-mode. Especially for generated buffers like calendars it makes little sense, and is less likely to cause other issues. – rpluim Jul 25 '18 at 20:16

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