perf: avoid unnecessary rerenders on the canvas #393
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Similar to part of #370 but improved.
Apprerenders only when rescan, which is currently the possibility to add/remove widgets. This is achieved byuseWidgetsStore(useShallow((state) => Object.keys(state.widgets))).WidgetContainerrerenders only when its rendering information or settings change, i.e.,WidgetContainers do not affect each other. This is achieved byuseWidgetsStore((state) => state.widgets[id]).I'm still uncertain about
React.memothing, thus not applying it here, but it is something to consider at some point.