fix(core): isolate undo history across document loads - #354

fix(core): isolate undo history across document loads#354

WolzRack wants to merge 4 commits into

floatboatai:mainfloatboatai/Nexus-Editor:mainfrom

WolzRack:fix/core-undo-history-boundaryWolzRack/Nexus-Editor:fix/core-undo-history-boundaryCopy head branch name to clipboard