Description: The context overlay (from show-paren) has some face issues. First, in case font-lock was not applied to a previous region of the buffer, the overlay will not display the context with font-lock. Second, the overlay will be displayed with the same background as the top-left line of the window instead of the original context background. Steps: 1) emacs -Q (master "b42cd524b46a4f29ef13e9d03be9d3df917f9aa3") 2) eval: (progn ;; enable overlay context in show-paren (setopt show-paren-context-when-offscreen 'overlay) ;; just to have a different background to reproduce issue #2 (add-hook 'c-mode-hook #'whitespace-mode)) 3) Open file src/xdisp.c from emacs source tree: C-x C-f emacs/src/xdisp.c 4) Go to line 13418: M-g M-g 13418 5) Go to next char (the context overlay will be displayed): C-f Problem 1: the overlay context does not have font-lock, since font-lock was not applied to the previous area that contains the context. As a workaround, execute C-M b (to navigate to context and force font-lock update) and then C-M-f to navigate back and display again the overlay context (with correct font-lock, this time). I expect the context overlay to always be displayed with an updated font-lock. Problem 2: the overlay context will be displayed with the same background color as the top-left line of the window (yellow, in this case, because of whitespace-mode). I expect the context overlay to always show the correct background, regardless of the face in the top-left line. See attached images for more information.