Fix bug #16151 with background of display margins.
src/xdisp.c (extend_face_to_end_of_line): Extend background of non-default face in margin areas as well. (Bug#16151) (display_line): Call extend_face_to_end_of_line for continued lines as well, if the display margins have non-zero width. (set_glyph_string_background_width): When needed, set the extends_to_end_of_line_p flag on glyph strings to be drawn in margin areas, not only in the text area.
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