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On my laptop when I change the Javascript of my Cordova app and refresh the preview page all my changes are reflected right away.
Today I installed Eclipse Luna with MobileFirst Platform 6.3 on my desktop machine but my Javascript changes require me to redeploy the app to reflect, if I just refresh the preview page I get an old version of the app, how can I change the behavior to be similar to my laptop?
Update: the fix is now available from either IBM Fix Central or by updating from Eclipse Marketplace.
The behavior your are referring to is called 'fast preview', where upon saving any web resource change in Studio will be displayed by a refresh in the browser, w/out needing to re-build and deploy the web resources.
This feature got broken due to a regression. It has been identified to be introduced in a recent 6.3 iFix release.
It is in the process of being fixed; you'll need to wait a little while longer for the fix to arrive.
If you'd like, you can open a PMR to get an iFix once the fix is published, or check once in a few days for updates to your installed plug-in via Eclipse > Help > Check for updates.