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A new basic face 'margin' is used for text displayed in the left and right margin areas, i.e., the areas typically used by VCS and LSP packages for per-line annotations. Its background defaults to the frame default, preserving existing behavior for users who do not customize it. * etc/NEWS: Document the new 'margin' face. * lisp/faces.el (margin): Add 'margin' face, inheriting from 'default'. * src/dispextern.h (face_id): Add MARGIN_FACE_ID. * src/xdisp.c (face_at_pos): Use 'margin' as the base face for strings displayed in margin areas so that they inherit the gutter background by default. (extend_face_to_end_of_line): Compute 'margin_fill_face_id' from the 'margin' face. Use while loops to explicitly fill all empty character slots in both left and right margins for both GUI and TTY branches. (display_line): Call 'extend_face_to_end_of_line' for beyond-EOB rows when the window has margins. Also extend the existing condition for text rows with empty margins to trigger when the 'margin' face background differs from the frame default, not only when the default face is remapped. * src/xfaces.c (realize_basic_faces): Realize 'margin' as a basic face to support face-remapping and efficient lookup. (Bug#80693) |
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