quickdraw:  Unfuck TextWrangler's broken indenting

TextWrangler 4.5.3 is incapable of block indentation (without corrupting
blank lines).
quickdraw:  Rename local right to last
quickdraw:  Factor out scan_for_last_h_coord()
quickdraw:  Store bbox members only once
Merge branch 'set_region_bbox-refactor'
quickdraw:  Replace Rect type in set_region_bbox()