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Defining theme files is very time consuming at the moment: - Only subsets of different CSS standards are supported. Content assist could help to see what's available. Editor templates for standard tasks (e.g. background gradient) would be helpful, too. - Testing themes needs a RAP server restart and a refresh in the browser which takes some seconds. A kind of preview or a possibility to apply changes into a running app would greatly improve the developer experience.
The issues described here are covered by bug 324562 and bug 312219 in the meanwhile. Please reopen if you disagree.