Gridline tick gap issue

Reproduction

• git clone --recursive https://github.com/j-n-white/gridline-rendering-issue-example.git (using --recursive is important here, as it will initialise the client's create-react-app submodule)

• npm install

• npm start

• Open http://localhost:3000 to view it in the browser. (This issue has been reproduced in Chrome 57.0.2987.133 and Firefox 52.0.2 (32-bit))

• Maximise the window. The graph will render correctly

• Restore the window to a non-fullscreen size. The graph will render with a small gap between the grid lines and the axis ticks.