Cover Grid: Dynamically adjust the size of the in memory cover thumbnail cache based on the window size to ensure flicker free rendering even on very large screens.
Template tester: Remember last used template
Get Books: When downloading books show a popup message telling the user that the books will be added to the calibre library automatically, to help new users understand what is happening. The popup message can be disabled.
E-book viewer: Try to detect when a chapter has a page break before the start of the chapter's text resulting in a leading blank page and override the page break.
Edit metadata dialog: Fix the author sort field not being marked red initially when the author sort does not match the author due to a Qt 5 behavior change.
OS X: Fix restarting of calibre not working if calibre.app is placed in a location with spaces in the path
Fix regression that caused calibre running in debug mode on OS X to not have a menubar or dock icon
Get Books: Fix downloading ebooks from Project Gutenberg via the builtin browser not working because of changes to the Project Gutenberg website.
Get Books: Update Gutenberg plugin for changes to the Project Gutenberg website.