fixits: avoid generating empty lines

* src/fixits.c (fixits_run): If erase the content of a line, also
erase the following \n.
* tests/input.at (Deprecated directives): Update expectations.

src/fixits.c

@@ -161,6 +161,21 @@ fixits_run (void)
             break;
           ++offset;
         }
+      /* If erasing the content of a full line, also remove the
+         end-of-line. */
+      if (f->fix[0] == 0 && f->location.start.column == 1)
+        {
+          int c = getc (in);
+          if (c == EOF)
+            break;
+          else if (c == '\n')
+            {
+              ++line;
+              offset = 1;
+            }
+          else
+            ungetc (c, in);
+        }
     }
   /* Paste the rest of the file.  */
   {

tests/input.at

@@ -2586,7 +2586,6 @@ AT_CHECK([cat input.y], [],
 %output "foo"
 %pure-parser
 %token-table
-
 %glr-parser
 %define api.prefix {bar}
 %%
@@ -2594,7 +2593,7 @@ exp : '0'
 ]])
 
 AT_BISON_CHECK([[-fcaret input.y]], [[1]], [],
-[[input.y:28.1-24: error: %define variable 'api.prefix' redefined
+[[input.y:27.1-24: error: %define variable 'api.prefix' redefined
  %define api.prefix {bar}
  ^~~~~~~~~~~~~~~~~~~~~~~~
 input.y:19.1-24:     previous definition