On second thought...

Causes char-table-p errors in some cases.

Setting hscroll-margin = 0 in dashboard accomplishes the same thing, by
preventing truncation glyphs from ever appearing anyway.

core/core-ui.el

@@ -102,9 +102,6 @@ Also see `doom-before-switch-buffer-hook'.")
 
 (fset #'yes-or-no-p #'y-or-n-p) ; y/n instead of yes/no
 
-;; Seriously, don't show glyphs on long-lines
-(set-display-table-slot standard-display-table 0 ?\ )
-
 
 ;;
 ;; Shims

modules/ui/doom-dashboard/config.el

@@ -63,6 +63,7 @@ Possible values:
         buffer-read-only t)
   (setq-local whitespace-style nil)
   (setq-local show-trailing-whitespace nil)
+  (setq-local hscroll-margin 0)
   (cl-loop for (car . _cdr) in fringe-indicator-alist
            collect (cons car nil) into alist
            finally do (setq fringe-indicator-alist alist))