Public Access
jaap-jan
a2c56de1f2
Creating a team drew its owner twice. ReloadAsync rebuilds the team list and then reselects, and the selection handler answers that assignment by starting its own read of the members, invitations and vaults — while ReloadAsync is awaiting a read of exactly the same thing. Both clear the collections up front and both append when their round trip answers, so everything below the team list was drawn twice. On a team nobody has been added to yet, whose only member is its owner, that read as the owner being in the team twice. The rows are records, so the reselect only raises a change when something about the team has actually moved — which is every reload that follows a change: creating a team, adding a member, renaming one. A plain refresh looked fine, and the screen doubled precisely after the acts people come to this screen to perform. isReselecting suppresses the handler for the length of the assignment rather than deduplicating rows afterwards, because only one of the two reads is awaited. A command that reloads and then reads Members has to be looking at the reload's own read and not at a fire-and-forget one that may not have answered. The generation counter is the other half, and it is a different bug with the same cause: selecting a second team before the first has answered leaves two reads in flight against the same collections and nothing decides which wins, so team A's members could land in the list under team B's name. A superseded read now drops its answer instead of appending it. Why nothing caught this. The fake server answers from memory, so every read completes before the next begins and the appends can never interleave — the duplicate needs a round trip to hold two reads open at once. FakeVaultServer grows a MemberReadGate for that, and the new test holds a read open and counts the reads in flight, which is the only moment a second one is distinguishable from the first. It fails against the old behaviour with two. 237 tests pass in the app suite and 83 in the layout suite.