[ui] NodeEditor: Don't allow to reduce split view size below 350

[cbentejac]

Description

This prevents reducing the Node Editor up to the point where components within it (especially in its header) are disappearing from screen.

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 79.08%. Comparing base (c2f3115) to head (0ad4a49). :warning: Report is 5 commits behind head on develop. :white_check_mark: All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2699   +/-   ##
========================================
  Coverage    79.08%   79.08%           
========================================
  Files           51       51           
  Lines         6889     6889           
========================================
  Hits          5448     5448           
  Misses        1441     1441           

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[cbentejac]

Okay after rebase, but maybe also increase the minimumWidth for the TabPanel

Done!