Merge pull request #276 from flower-platform/GH275-recycling-issue-node-size

#275 - Recycling issue fix: reset size for recycled renderers
#257 - improvements for sidebar
Merge pull request #277 from flower-platform/GH257-improvements-for-sidebar

#257 - improvements for sidebar
GH278 - Iteration 1: adding "pseudo"commands in a global list, to test
propagation on client
#275 - Recycle renderers only of the same type