See v4.13.0's changelog for a majority of other changes.

ADDITIONS

• #948, fixes a crash caused by a null thumbnail URL.
• #949, fixes a crash that makes no sense???
• #951, fixes a memory leak with ThumbnailViews.
• #952, fixes a clash between day/night themes, even if a device didn't have access to a night theme. Also ensures the toolbar color in the theme setup controller is correct when toggling between day/night.