format: only add extra empty line below, not above

plugin/format.vim

@@ -192,48 +192,45 @@ endfunction
 function! Format_section_comment_lines() abort
   let cursor = winsaveview()
 
-  " open a new comment line below (and another blank line below it)
-  normal! 2o
-  normal! cc
+  " open a new comment line above
+  normal! O
 
   " return to starting position
-  normal! 2k
+  normal! j
 
-  " open a new comment line above (and another blank line above it)
-  normal! 2O
-  normal! kcc
+  " open a new comment line below and another blank line below that
+  normal! 2o
+  normal! cc
 
   " return to starting position
   call winrestview(cursor)
-  normal! 2j
+  normal! j
 endfunction
 
 " format line as comment section, surrounding with blank comment lines
 function! Format_section_minus_signs() abort
   let cursor = winsaveview()
 
-  " open a new comment line below (and another blank line below it)
-  normal! 2o
-  normal! cc
+  " open a new comment line above
+  normal! O
 
-  " add minus sign separators on the newly opened comment line below
-  normal! k
+  " add minus sign separators on the newly opened comment line above
   call Format_separator_minus_sign()
 
   " return to starting position
-  normal! k
+  normal! j
 
-  " open a new comment line above (and another blank line above it)
-  normal! 2O
-  normal! kcc
+  " open a new comment line below and another blank line below that
+  normal! 2o
+  normal! cc
 
-  " add minus sign separators on the newly opened comment line above
-  normal! j
+  " add minus sign separators on the newly opened comment line below
+  normal! k
   call Format_separator_minus_sign()
 
   " return to starting position
   call winrestview(cursor)
-  normal! 2j
+  normal! j
 endfunction
 
 " insert or update section separator at end of current line