[stable10] - center image load spinner in files sidebar - use fixed heights to prevent sidebar content to hop around - use image previews which fill the whole preview area in the sidebar
[stable10] - center image load spinner in files sidebar
- use fixed heights to prevent sidebar content to hop around
- use image previews which fill the whole preview area in the sidebar

owncloud/core,phil-davis/core,owncloud/core,owncloud/core,owncloud/core,owncloud/core