add so-long config to handle files with very long lines

settings/general-settings.el

@@ -188,6 +188,13 @@ with a drive letter and a colon.")
 ;; truncate lines even in partial-width windows
 ;;(setq truncate-partial-width-windows t)
 
+(use-package so-long
+  :config
+  ;;(add-to-list 'so-long-target-modes 'mhtml-mode t)
+  (setq so-long-max-lines nil)  ;; by default only 5 non-blank lines are tested
+  (setq so-long-action 'so-long-minor-mode)  ;; so-long-mode
+  (global-so-long-mode 1))
+
 ;; display line numbers to the right of the window
 ;; (global-linum-mode t)  ;; deactivated because the DocView showing pdf files becomes extremly slow when global-linum-mode is on.