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    <p>All the possible settings to do that seem to be <a href="http://www.emacswiki.org/emacs/BlankMode" rel="nofollow noreferrer">summarized here (blank-mode)</a> and here <a href="http://www.emacswiki.org/emacs/ShowWhiteSpace" rel="nofollow noreferrer">and here (ShowWhiteSpace)</a></p> <p>also:</p> <pre><code>(if (&gt;= emacs-major-version 22) (progn ;; Mode to use with Emacs 22 ;; http://emacswiki.org/cgi-bin/wiki/BlankMode (require 'blank-mode) ;; Mode not active by default: let's activate it (global-blank-mode t) ;; ... activate it when text mode where color syntax is not active by default (add-hook 'text-mode-hook 'blank-mode-on) ;; All invisible chars are shown, except newline char. (setq blank-chars '(tabs spaces trailing lines space-before-tab)) ;; Show only for one color, no mark inserted (setq blank-style '(color)) ;; Use for normal space (not shown) (set-face-background 'blank-space-face nil) (set-face-foreground 'blank-space-face "black") ;; used for non breakable space (set-face-background 'blank-hspace-face "PaleGreen") (set-face-foreground 'blank-hspace-face "black") ;; Used for spaces left of a tab (set-face-background 'blank-space-before-tab-face "orange") (set-face-foreground 'blank-space-before-tab-face "black") ;; Used for tab (set-face-background 'blank-tab-face "lemonchiffon") (set-face-foreground 'blank-tab-face "black") ;; used for extra space at the end of a line (set-face-background 'blank-trailing-face "gold") (set-face-foreground 'blank-trailing-face "black") ;; Used for line too long (set-face-background 'blank-line-face "snow2") (set-face-foreground 'blank-line-face "black") ) (progn ;; For older Emacs prior to version 22. ;; http://www.emacswiki.org/cgi-bin/wiki/show-wspace.el (require 'show-wspace) (add-hook 'font-lock-mode-hook 'show-ws-highlight-tabs) (add-hook 'font-lock-mode-hook 'show-ws-highlight-hard-spaces) (add-hook 'font-lock-mode-hook 'show-ws-highlight-trailing-whitespace) ) ) </code></pre>
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