(Qcenter): Declare here.
(syms_of_xdisp): intern and staticpro it. (handle_single_display_prop): Allow space display property on all platforms. (display_mode_line): Set mode_line_p before displaying line. (calc_pixel_width_or_height): Declare extern. Add separate :align-to handling. Remove complex cases for fringes and scroll-bars. Add left, right, and center alignment positions. Add text (area) width/height. Return width or height for image specs. (produce_stretch_glyph): Improve handling of :align-to. Is now relative to left of text area by default, but other base offsets can be specified -- also for text lines.
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