Version 5.26 was never released. There are three changes in version 5.27:
- If TeXShop is quit when files are open, the files appear in their old location the next time TeXShop starts.
This behavior depends on the setting "Close windows when quitting an application" in the Desktop and Dock module of System Preferences. Restoring windows sometimes caused a long delay opening TeXShop after rebooting the Mac. This delay was caused by calling "scroll rect to visible" rather than "goto page" when preview window contents were scrolled to their old position. Apparently the first option caused the Mac to render all the pages of the document before opening it. The problem is fixed.
- John Collin's latexmk has been updated to version 4.83.
- TeXShop can now syntax color expl3 code. See the chapter on expl3 in the TeXShop Manual, available in the TeXShop Help menu. According to a readme document from the LaTeX3 team, expl3 "provides the foundation on which new additions to the LaTeX kernel and other advanced extensions are built. The commands provided are not intended for use at the document level." By default, TeXShop syntax colors as usual, but if a new menu item is toggled on, it also syntax colors any expl3 code in the source.