Improve display of glyph matrix by dump-glyph-matrix.
src/xdisp.c (dump_glyph): Align glyph data better. Use "pD" instead of a non-portable "t" to print ptrdiff_t values. Allow up to 9 digits for buffer positions, before misalignment starts. Display "0" for integer "object" field. (dump_glyph_row): Adapt the header line to changes in dump_glyph. Display the newline glyph more unambiguously.
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