Improvements and Fixes

[obuchtala]

• [x] hide disabled insert tools
• [x] improve pasting for list items
• [x] fix regressions of undo-history refactor

[codecov[bot]]

Codecov Report

Merging #1200 into master will increase coverage by 0.24%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1200      +/-   ##
==========================================
+ Coverage   86.45%   86.69%   +0.24%     
==========================================
  Files         399      399              
  Lines        8982     8983       +1     
==========================================
+ Hits         7765     7788      +23     
+ Misses       1217     1195      -22

Impacted Files	Coverage Δ
src/kit/ui/ToolGroup.js	88.88% <ø> (-4.17%)	:arrow_down:
src/article/shared/ArticleToolbarPackage.js	100% <ø> (ø)	:arrow_up:
src/article/editor/EditorPackage.js	100% <ø> (ø)	:arrow_up:
src/article/ArticlePanel.js	85.13% <100%> (-1.36%)	:arrow_down:
src/kit/app/EditorSession.js	94.02% <100%> (+3.12%)	:arrow_up:
src/dar/DarFileStorage.js	96.92% <100%> (ø)	:arrow_up:
src/article/converter/html/HeadingConverter.js	100% <100%> (+50%)	:arrow_up:
src/article/shared/EditorPanel.js	78.66% <100%> (-1.34%)	:arrow_down:
src/dar/FSStorage.js	72.97% <100%> (ø)	:arrow_up:
src/dar/cloneArchive.js	83.33% <100%> (ø)	:arrow_up:
... and 5 more

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[obuchtala]

I have revealed some regressions related to the new Undo history implementation, which are pretty severe. I'd like to fix these before releasing.