[FragmentFD] Respect `--no-continue`

* discard partial fragment on `--no-continue`
* continue with correct progress display otherwise

Resolves #21467

1 files changed, 4 insertions, 6 deletions

diff --git a/youtube_dl/downloader/dash.py b/youtube_dl/downloader/dash.py
index c6d674bc6..cc30485f8 100644
--- a/youtube_dl/downloader/dash.py
+++ b/youtube_dl/downloader/dash.py
@@ -38,8 +38,7 @@ class DashSegmentsFD(FragmentFD):
             # In DASH, the first segment contains necessary headers to
             # generate a valid MP4 file, so always abort for the first segment
             fatal = i == 0 or not skip_unavailable_fragments
-            count = 0
-            while count <= fragment_retries:
+            for count in range(fragment_retries + 1):
                 try:
                     fragment_url = fragment.get('url')
                     if not fragment_url:
@@ -57,9 +56,8 @@ class DashSegmentsFD(FragmentFD):
                     # is usually enough) thus allowing to download the whole file successfully.
                     # To be future-proof we will retry all fragments that fail with any
                     # HTTP error.
-                    count += 1
-                    if count <= fragment_retries:
-                        self.report_retry_fragment(err, frag_index, count, fragment_retries)
+                    if count < fragment_retries:
+                        self.report_retry_fragment(err, frag_index, count + 1, fragment_retries)
                 except DownloadError:
                     # Don't retry fragment if error occurred during HTTP downloading
                     # itself since it has own retry settings
@@ -68,7 +66,7 @@ class DashSegmentsFD(FragmentFD):
                         break
                     raise
 
-            if count > fragment_retries:
+            if count >= fragment_retries:
                 if not fatal:
                     self.report_skip_fragment(frag_index)
                     continue