Update connectivity detection

Mingle Card: 5883 Narrative

We currently actively detect if we have an actual internet connection to our server and show an indicator on the sync screen when connection status changes.

The module we currently use modifies the browser’s built in XMLHttpRequest object (noooooooooo!). Find another way to implement connectivity detection.

Acceptance Criteria

Detect connectivity status without modifying the browser’s XMLHttpRequest object.

Analysis

verify online/offline status works across browsers we need to support: https://caniuse.com/#feat=online-status
‘system/connectivity’ module already exposes an API. Implement its internals without using the ‘vendor/offline’ module (delete this!)

Tasks

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Defects

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githubbob42 / mingle2github2