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mastodon-sc / mastodon

Mastodon – a large-scale tracking and track-editing framework for large, multi-view images.
BSD 2-Clause "Simplified" License
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Prevent TrackScheme From Freezing When Removing A Root Spot #312

Closed maarzt closed 5 months ago

maarzt commented 5 months ago

This PR fixes a bug that causes the TrackScheme window to freeze after the following two steps:

  1. Use "View > Show Only Selected Tracks"
  2. Delete one of the visible root nodes

Here is a screen cast, demonstrating how to reproduce the problem:

trackscheme-roots-bug

The bug is triggered because the DefaultRootsModel and BranchTrackSchemeRootsModel keep a list of roots to be shown in the TrackScheme view. If one of the roots is removed from the ModelGraph, it becomes invalid, but the invalid entry still remains in the list of roots. The exception is triggered when the invalid object is processed by the PainterThread.

This PR fixes the bug, by removing the invalid entry from the list of roots as soon as the corresponding Spot is removed from the ModelGraph.

maarzt commented 5 months ago

@tinevez Disclaimer: The bug that is fixed in this PR was introduced by me. So I'm the one to blame here.