Plotly.react always redraw if a config option is provided #3121
Description
Running tests in plot_api_test.js result in Test plot api @noCIdep Plotly.react can redraw "airfoil" with no changes as a noop (svg mocks) FAILED.
The culprit is in PR #3090 which introduces new private attributes into _context. Because diffConfig does not ignore those, Plotly.react always redraw.