coding style: reduce text width to 109 characters

Patches are shown on github with a fixed width (no matter how wide the window
is). When line numbers are high (we have some files with 5 digit line numbers),
the diff does not fit, and horizontal scrolling must be used when viewing the
patch. This is super annoying. Let's reduce the width a bit. I think 109 is
still very wide, but at least the github issue should be alleviated.

.dir-locals.el

@@ -2,14 +2,14 @@
 ; A list of (major-mode . ((var1 . value1) (var2 . value2)))
 ; Mode can be nil, which gives default values.
 
-; Note that we set a line width of 119 for .c and XML files, but for everything
+; Note that we set a line width of 109 for .c and XML files, but for everything
 ; else (such as journal catalog files, unit files, README files) we stick to a
 ; more conservative 79 characters.
 
 ; NOTE: If you update this file make sure to update .vimrc and .editorconfig,
 ; too.
 
-((c-mode . ((fill-column . 119)
+((c-mode . ((fill-column . 109)
             (c-basic-offset . 8)
             (eval . (c-set-offset 'substatement-open 0))
             (eval . (c-set-offset 'statement-case-open 0))
@@ -17,7 +17,7 @@
             (eval . (c-set-offset 'arglist-intro '++))
             (eval . (c-set-offset 'arglist-close 0))))
  (nxml-mode . ((nxml-child-indent . 2)
-               (fill-column . 119)))
+               (fill-column . 109)))
  (meson-mode . ((meson-indent-basic . 8)))
  (sh-mode . ((sh-basic-offset . 8)
              (sh-indentation . 8)))

.vimrc

@@ -4,7 +4,7 @@
 " You should consider setting 'set secure' as well, which is highly
 " recommended!
 
-" Note that we set a line width of 119 for .c and XML files, but for everything
+" Note that we set a line width of 109 for .c and XML files, but for everything
 " else (such as journal catalog files, unit files, README files) we stick to a
 " more conservative 79 characters.
 
@@ -16,5 +16,5 @@ set shiftwidth=8
 set expandtab
 set makeprg=GCC_COLORS=\ make
 set tw=79
-au BufRead,BufNewFile *.xml set tw=119 shiftwidth=2 smarttab
-au FileType c set tw=119
+au BufRead,BufNewFile *.xml set tw=109 shiftwidth=2 smarttab
+au FileType c set tw=109

docs/CODING_STYLE.md

@@ -11,7 +11,7 @@
 
 - Don't break code lines too eagerly. We do **not** force line breaks at 80ch,
   all of today's screens should be much larger than that. But then again, don't
-  overdo it, ~119ch should be enough really. The `.editorconfig`, `.vimrc` and
+  overdo it, ~109ch should be enough really. The `.editorconfig`, `.vimrc` and
   `.dir-locals.el` files contained in the repository will set this limit up for
   you automatically, if you let them (as well as a few other things).
 

man/.dir-locals.el

@@ -7,7 +7,7 @@
             (eval . (c-set-offset 'arglist-intro '++))
             (eval . (c-set-offset 'arglist-close 0))))
  (nxml-mode . ((nxml-child-indent . 2)
-               (fill-column . 119)))
+               (fill-column . 109)))
  (meson-mode . ((meson-indent-basic . 8)))
  (nil . ((indent-tabs-mode . nil)
          (tab-width . 8)