The line number at the top of each code line disappeared after I re-opened a program file. I'm not sure how and when it happened. I must have changed some system setting without knowing it. I cannot make the numbers re-appear myself. I tried several opening methods: using gedit from the command area, or selecting
file > open > selection window on top of the terminal window and even reset the system, and restart. Nothing worked.
PDF output versions of these files, on the other hand, do carry the numbers. Line & col numbers in lower right corner of the screen are working. Tried to open another C program in another directory, it showed the same symptom. The efficiency of my debugging has been degraded a great deal because of this. How can I get back the line numbers in gedit?