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* src/dispextern.h (face, face_underline_type, syms_of_xfacse) (internal-set-lisp-face-attribute) (gui_supports_face_attributes_p): Add definitions for new underline styles of Double-line, Dots and Dashes. Rename FACE_UNDER_LINE and FACE_UNDER_WAVE to make definitions consistent. Delete tty_underline_p from the face struct and use just underline going forward. Add a flag to check whether styled underlines are available. * lisp/cus-face.el (custom-face-attributes): Add entries for Double-line, Dots and Dashes so they can be set through `customize'. * src/termchar.c (tty_display_info): Add an entry for the escape sequence to set the underline style and color on terminal frames. * src/term.c (init_tty, tty_capable_p, turn_on_face): Read and save the underline style escape sequence from the Smulx termcap (alternatively if the Su flag is set use a default sequence). Allow checking for support of styled underlines in the current terminal frame. Output the necessary escape sequences to activate a styled underline on turn_on_face; this is currently only used for the new special underline styles, a default straight underline will still use the "us" termcap. Output escape sequence to set underline color when set in the face and supported by the tty. Save a default value for this sequence on init_tty when styled underlines are supported. * src/xfaces.c (tty_supports_face_attributes_p, realize_tty_face) (map_tty_color): Assert whether styled underlines are supported by the current terminal on display-supports-face-attributes-p checks. Populate the correct underline style and color in the face spec when realizing a face. Allow map_tty_color to map underline colors alongside foreground and background. The interface of map_tty_color was amended to allow the caller to supply the underline color instead of accessing it through the face attributes. (bug#62994) * src/xterm.c (x_draw_glyph_string): Updated to use renamed FACE_UNDERLINE_SINGLE and FACE_UNDERLINE_WAVE face_underline_type enumerations. |
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