* src/otlayout/otljstf.c (otl_jstf_gsub_mods_validate): Removed. (otl_jstf_gpos_mods_validate): Renamed to... (otl_jstf_gsubgpos_mods_validate): This. Test whether lookup_count is zero. (otl_jstf_priority_validate): Use otl_jstf_gsubgpos_mods_validate. (otl_jstf_validate): Initialize gsub_lookup_count and gpos_lookup_count if gsub or gpos is zero. * src/otlayout/otlgsub.c: Rename counting variables to be more meaningful. Add copyright. (otl_gsub_lookup1_validate): Simplify code. (otl_gsub_lookup2_validate, otl_gsub_lookup3_validate, otl_gsub_lookup4_validate, otl_gsub_lookup7_validate): Remove unused variables. (otl_gsub_lookup5_validate): Remove unused variable. Fix call to otl_sub_rule_set_validate and otl_sub_class_rule_set_validate. (otl_chain_sub_class_rule_validate, otl_chain_sub_class_set_validate): Removed. (otl_gsub_lookup6_validate): Remove unused variable. Fix call to otl_chain_sub_rule_set_validate. (otl_gsub_lookup7_validate): Handle lookup type 8 also. (otl_gsub_lookup8_validate: New function. (otl_gsub_lookup1_apply, otl_gsub_lookup2_apply, otl_gsub_lookup3_apply): Commented out. (otl_gsub_validate_funcs): Add otl_gsub_lookup7_validate and otl_gsub_lookup8_validate. (otl_gsub_validate): Updated. * src/otlayout/otlgsub.h: Add copyright. * src/otlayout/otlcommn.c, src/otlayout/otlcommn.h (otl_coverage_get_index): Comment out.