modelsAddedmethod, a 'batching' flag is set which prevents new controls from being rendered until all controls have been generated. When the batching is done, the
batchingChangedmethod renders the container, which makes the container reflow and - in my case - arrange it's panels.
resetmethods, no batching flag is set and each child is rendered pretty much immediately. This means the container does not reflow, and added panels will not be arranged.
batchingflag is not used at all and the container doesn't reflow at all unless I explicitly tell it to. The
batchingChangedcallback are still left in place though.
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