Fix bug #11832 with truncated lines when fringes are disabled on GUI frames.
src/xdisp.c (init_iterator): Get dimensions of truncation and continuation glyphs even if on GUI frames. Adjust it->last_visible_x on GUI frames when the left or right fringes, or both, are absent. (start_display, move_it_in_display_line_to): Handle the case of a GUI frame without a fringe to display continuation or truncation glyphs. (insert_left_trunc_glyphs): Support GUI frames: make sure truncation glyphs overwrite enough glyphs from the current line to have sufficient space in pixels. (display_line): Support truncation and continuation glyphs on GUI frames. If some spare pixels are left on the line after inserting the truncation glyphs, fill that space with a stretch glyph of a suitably computed width. src/term.c (produce_special_glyphs): Call PRODUCE_GLYPHS, not produce_glyphs, to support GUI sessions.
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