fix: Only calculate available connections once. #690
Merged
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This PR fixes #674. The sorting of available connections is not stable, so in some cases traversing to the next/previous item could cut out available connections. Now, rather than finding and sorting the list of available connection points for every move action, the list is calculated once and stored for the duration of the drag/move event. This is both more efficient and means that the stability of the sort is immaterial, because it only happens once. With this change, navigating a block structure similar to that reported in the issue yields the same visitation order regardless of going forward/backward.