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Use buffer-display-table instead of standard-display-table: (defun my-text-mode-hook-fun () (unless buffer-display-table (setq buffer-display-table (make-display-table))) (aset buffer-display-table ?\t (vconcat "!---"))) (add-hook 'text-mode-hook #'my-text-mode-hook-fun) Also note that there is the highly configurable whitespace-mode for your ...


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Emacs has some variables to configure when the debugger should be invoked. They all begin with debug-.... For your situation the variable debug-on-message could help. Set it to the string of the message and trigger the error. This should open a backtrace, which should help you to find the problematic piece of code.


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