_auto_signal_file_names: fix counting channels per group.

Benjamin Moody · Benjamin Moody · commit 5375b971df7a · 2023-05-11T12:39:33.000-04:00
Since the FLAC format has a hard limit of eight channels, we need to use multiple signal files if a record contains more than eight signals. Commit d1d26ba was meant to do this automatically (when Record.set_default or wfdb.wrsamp is used to generate the signal file names), but this was never tested.
diff --git a/wfdb/io/_header.py b/wfdb/io/_header.py
@@ -384,6 +384,7 @@ def _auto_signal_file_names(self):
                     num_groups += 1
                     channels_in_group = 0
             group_number.append(num_groups)
+            channels_in_group += 1
             prev_fmt = ch_fmt
             prev_spf = ch_spf
 
