Recognise Tile Regions in JamPC grid tile size overrides

{
  "backend": {
    "author": {
      "email": "drschwabe@fastmail.com",
      "name": "Derrick Schwabe",
      "time": 1789249508
    },
    "commit": "git:sha1:d8b75e5f6ff47cefd0547e099f9dc11ff58338ab",
    "committer": {
      "email": "drschwabe@fastmail.com",
      "name": "Derrick Schwabe",
      "time": 1789249508
    },
    "manifest": "mmm-manifest:sha256:a6ea2c3100dab0cc3fda709843f06eb6e03a416eab7440330ec935f603a560b8",
    "message": "Recognise Tile Regions in JamPC grid tile size overrides\n\nPer-grid tile size overrides looked for Tile Region groups by the kind\n'tiled-stamp-group', but regions have been saved as 'tiled-stamp-region'\nsince grouped stamping was added two days earlier. No saved mesh has ever\nheld the first name, so a region never qualified: right-clicking a\nregion's stamp on a JamPC screen offered the override for the single\ntile, right-clicking its layer row offered nothing, and a region could\nnot become a grid's tile size source.\n\nJamPC now asks tiled's isTileStampGroup rather than repeating the kind as\na string. Its tests passed throughout because their fixtures used the\nsame wrong name; they now use the exported constant, and a new test\nbuilds its region with createTileStampGroup itself.",
    "objectFormat": "sha1",
    "parents": [
      "git:sha1:bbd4102bcf6f44423794d6ab5bf537ba6206a842"
    ],
    "ref": "refs/heads/master",
    "summary": "Recognise Tile Regions in JamPC grid tile size overrides",
    "tree": "git:sha1:d1c8c25cbffd29bfdab4422b24422ebdbbf6da3f",
    "type": "git"
  },
  "issuedAt": "2026-09-13T15:05:56.195Z",
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  "protocol": "mmm/0-alpha",
  "sequence": 197,
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