[Tile-serving] [openstreetmap/osm2pgsql] Gazetteer: move main tag filtering into processing function (#1018)

[Sarah Hoffmann]

Filtering of main tags (i.e. handling of named-only tags or fallback tags) must happen before the actual output because the filtered list is already needed when computing the list of classes to keep. Currently the function that creates the  class list does its own filtering and is inconsistent with  what the output function does.

Also fixes use of new_line().
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1018

-- Commit Summary --

  * tests: simplify tests for gazetteer
  * gazetteer: move main tag filtering into processing function
  * tests: add test for updates of gazetteer output
  * gazetteer: further simplify copy_out() function
  * gazetteer: fix key for domain names

-- File Changes --

    M src/gazetteer-style.cpp (344)
    M src/gazetteer-style.hpp (27)
    M src/output-gazetteer.cpp (21)
    M src/output-gazetteer.hpp (2)
    M tests/common-import.hpp (9)
    M tests/test-output-gazetteer.cpp (264)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1018.patch
https://github.com/openstreetmap/osm2pgsql/pull/1018.diff

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