refactor!: Use one map for toolbox contents. #8654
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The basics
The details
Proposed Changes
This PR updates the toolbox to use a single
Map
for keeping track of its contents, in place of an array and an object keyed by ID. Previously, these two sources of truth needed to be kept in sync, which was error prone, and also minorly memory inefficient. Now, there is a single source of truth. This is a breaking changed because theprotected
fieldscontents_
andcontentMap_
have been removed and replaced by the singleprotected
fieldcontents
.