Quantize glyph scaling and add glyph diagnostics#473
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Summary
:heightscales to an integral font pixel size so Emacs cannot round scaled glyphs back over the cell boundghostel-debug-glyph-at-pointto report text properties, font metrics, renderer-consumed metrics, and shaped glyph vectors at pointVerification
emacs --batch -Q -L lisp -L test -l ert -l test/ghostel-test-helpers.el -l test/ghostel-glyph-test.el --eval "(ert-run-tests-batch-and-exit 'ghostel-test-glyph-adjust-quantizes-height-scale)"rm -f .build/tests/elisp-ghostel-debug-test.ok && make .build/tests/elisp-ghostel-debug-test.ok