fix: in an incremental backup, update total file count if needed

Previously, we were showing "N/M", where N is the number of files
found in the current backup run, and M the number of files in the
previous backup. I found this confusing if the new run finds more
files than were in the previous run. Now we increment M if N goes
beyond it.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/backup_progress.rs b/src/backup_progress.rs
index b5ecc26..c6d16d9 100644
--- a/src/backup_progress.rs
+++ b/src/backup_progress.rs
@@ -55,6 +55,9 @@ impl BackupProgress {
 
     pub fn found_live_file(&self, filename: &Path) {
         self.progress.inc(1);
+        if self.progress.length() < self.progress.position() {
+            self.progress.set_length(self.progress.position());
+        }
         self.progress
             .set_message(&format!("{}", filename.display()));
     }