* src/tools/update-copyright-year: Fix single-year entry handling.

The fix from 2021-01-17 didn't cover the case where the year to be
updated is identical to the current year.

ChangeLog

@@ -1,3 +1,10 @@
+2021-02-13  Werner Lemberg  <wl@gnu.org>
+
+	* src/tools/update-copyright-year: Fix single-year entry handling.
+
+	The fix from 2021-01-17 didn't cover the case where the year to be
+	updated is identical to the current year.
+
 2021-02-13  Werner Lemberg  <wl@gnu.org>
 
 	Add new function `FT_Get_Transform`.

src/tools/update-copyright-year

@@ -105,6 +105,8 @@ while (<>)
         (?<space3>\ *)
         (?<end>.*)
       }
+      {
+        if ($+{first} < $year)
         {
           # Fill line to the same length (if appropriate); we insert three
           # spaces, the string `(C)', a `-', and the current year.
@@ -119,6 +121,23 @@ while (<>)
           print ' ' x $space if length($+{end});
           print "$+{end}\n";
           $replaced = 1;
+        }
+        else
+        {
+          # Fill line to the same length (if appropriate); we insert three
+          # spaces and the string `(C)'.
+          my $space = length($+{space1})
+                      + length($+{space2})
+                      + length($+{space3})
+                      - (length("(C)") + 3);
+
+          print "$+{begin}";
+          print "Copyright\ (C)\ $+{first}\ by";
+          # If $space is negative this inserts nothing.
+          print ' ' x $space if length($+{end});
+          print "$+{end}\n";
+          $replaced = 1;
+        }
       }ex
     ||
     # Otherwise print line unaltered.