Commits on Jul 4, 2021

1. pager: fix printing non-visible characters \001 & \002 …

   Fixes #2185 (Non-Visible Characters Printed with Page)
   
   The `--raw-control-chars` option (aka `-r`) does the following:
   
   ```
   Causes "raw" control characters to be displayed.  The default is
   to  display  control  characters  using  the caret notation; for
   example, a control-A (octal 001) is displayed as "^A".  Warning:
   when the -r option is used, less cannot keep track of the actual
   appearance of the screen (since this depends on how  the  screen
   responds to each type of control character).  Thus, various dis-
   play problems may result, such as long lines being split in  the
   wrong place.
   ```
   
   The `--RAW-CONTROL-CHARS` option was always used with the pager, I just expanded
   it from `-R`, so that it looks more descriptive. For reference, it does the
   following:
   
   ```
   Like  -r,  but  only ANSI "color" escape sequences are output in
   "raw" form.  Unlike -r, the screen appearance is maintained cor-
   rectly  in  most  cases.   ANSI  "color"  escape  sequences  are
   sequences of the form:
   
        ESC [ ... m
   
   where the "..." is zero or more color  specification  characters
   For  the  purpose  of  keeping  track of screen appearance, ANSI
   color escape sequences are assumed to not move the cursor.   You
   can  make less think that characters other than "m" can end ANSI
   color escape  sequences  by  setting  the  environment  variable
   LESSANSIENDCHARS to the list of characters which can end a color
   escape sequence.  And you can make less  think  that  characters
   other  than the standard ones may appear between the ESC and the
   m by setting the environment variable  LESSANSIMIDCHARS  to  the
   list of characters which can appear.
   ```

   

   kyrylo committed Jul 4, 2021
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