libreyolo label – Navigating Radar results with N skips flagged images #958

Description

After running Label-Error Radar and selecting a flagged image from the results dialog, pressing N navigates through only some of the flagged images. After a few presses, it jumps back to the first result instead of visiting all flagged images.

The results dialog closes when an image is selected, and the Radar button starts a new scan rather than reopening the previous results. This makes reviewing the remaining images inconvenient, especially with large datasets where scanning takes time.

Steps to reproduce

1. Open a dataset in libreyolo label and run Radar.
2. Select a flagged image from the results dialog.
3. Repeatedly press N to navigate to the next flagged image.

Expected behavior

N visits all flagged images in the order shown in the Radar results before wrapping back to the first one. It should also be possible to reopen the results dialog without running another scan.

Actual behavior

Some flagged images are skipped, and navigation can wrap back to the first result after only a few presses.

Possible cause

In commit 89efbe8, Radar sorts the deck by descending score in radar.py. However, nextFlagged() searches that score-sorted deck for the first image ID greater than the current ID. If none is found, it returns to the first deck entry.

For example, given IDs [7, 25, 3, 12, 30, 5] in deck order, navigation starting at 7 follows 7 → 25 → 30 → 7, skipping 3, 12 and 5.

Navigating by the current image's position in the deck instead of comparing numeric IDs should resolve this. A regression test with a deck whose IDs are not in ascending order would help verify the behavior.

Workaround

Run openRadar() in the browser's developer console to reopen the results dialog without rescanning. The dialog displays at most the first 80 entries.