[shotwell/wip/ricotz/vala] Accept string.index_of_nth_char() to return long or int for new valac

[Rico Tzschichholz <ricotz src gnome org>]

commit c1f5149ba8f5fcefe5b99df9663765ec2750ea8f
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Mon Oct 29 20:51:29 2018 +0100

    Accept string.index_of_nth_char() to return long or int for new valac

 src/NaturalCollate.vala | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/src/NaturalCollate.vala b/src/NaturalCollate.vala
index 4adb0273..6d38a08d 100644
--- a/src/NaturalCollate.vala
+++ b/src/NaturalCollate.vala
@@ -20,7 +20,7 @@ private const unichar SUPERDIGIT = ':';
 private const unichar NUM_SENTINEL = 0x2; // glib uses these, so do we
 private const string  COLLATION_SENTINEL = "\x01\x01\x01";
 
-private static int read_number(owned string s, ref int byte_index) {
+private static int read_number(owned string s, ref long byte_index) {
     /*
      * Given a string in the form [numerals]*[everythingelse]*
      * returns the int value of the first block and increments index
@@ -33,7 +33,7 @@ private static int read_number(owned string s, ref int byte_index) {
     while (s.length != 0 && s.get_char(0).isdigit()) {
         number = number*10;
         number += s.get_char(0).digit_value();
-        int second_char = s.index_of_nth_char(1);
+        var second_char = s.index_of_nth_char(1);
         s = s.substring(second_char);
         byte_index += second_char;
     }
@@ -56,7 +56,7 @@ public static string collate_key(owned string str) {
 
     while (!eos) {
         assert(str.validate());
-        int position = 0;
+        long position = 0L;
         while (!(str.get_char(position).to_string() in "0123456789")) {
             // We only care about plain old 0123456789, aping what g_utf8_collate_key_for_filename does
             position++;
@@ -69,7 +69,7 @@ public static string collate_key(owned string str) {
         str = str.substring(position);
 
         eos = (str.length == 0);
-        position = 0;
+        position = 0L;
 
         if (!eos) {
             // We have some numbers to handle in front of us