Attempt to fix crashes per bug #15575.
src/xdisp.c (deep_copy_glyph_row): Assert that the 'used' counts of FROM and TO are identical. Copy only the glyphs of TEXT_AREA. src/term.c (save_and_enable_current_matrix): Don't allocate and don't save margin areas. (restore_desired_matrix): Don't restore margin areas. (free_saved_screen): Don't free margin areas.
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