Fix annoying UI stalls after refresh (e.g. background fetch) when the reflog is very long #5135
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December 23, 2025 14:37
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Move SetContentLineCount into OverwriteLinesAndClearEverythingElse. Calling it separately beforehand is not concurrency safe; we need both to happen when the view's writeMutex is locked.
This fixes a bug in ListContextTrait.FocusLine whereby the view would go blank when scrolling by page (using ',' or '.') in views that have renderOnlyVisibleLines set to true but refreshViewportOnChange set to false. Currently we don't have any such views; the only ones who use renderOnlyVisibleLines are commits and subcommits, and they also use refreshViewportOnChange. However, we are going to add one in the next commit, and eventually it might be a good idea to convert all our list views to that by default, and get rid of the renderOnlyVisibleLines flag.
Since the reflog can get very long, this saves some memory but especially some UI thread lag. In one of my repos I had over 11'000 reflog entries (I guess I should prune them more regularly...), and rendering them took ~600ms; since this happens on the UI thread, there was an annoying stall for half a second after every background fetch, for example.
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Draw only the visible lines of the reflogs panel, like we do for commits.
Since the reflog can get very long, this saves some memory but especially some UI thread lag. In one of my repos I had over 11'000 reflog entries (I guess I should prune them more regularly...), and rendering them took ~600ms; since this happens on the UI thread, there was an annoying stall for half a second after every background fetch, for example (even if the reflog panel is not visible).