Kart import --replace-existing with identical shapefile results in schema change

[hamishcampbell]

Describe the bug

During testing of the import --replace-existing flag I've found that re-importing an identical shapefile appears to result in a schema change and a change to every feature. It was expected that I'd get an empty commit.

Similarly, if a minor change is made before re-importing, a schema change is applied and every feature modified. I would expect just the minor change to be applied.

To Reproduce
Steps to reproduce the behaviour:

mkdir test
kart import ~/Desktop/territorial-authorities-SHP/territorial-authorities.shp
kart import ~/Desktop/territorial-authorities-SHP/territorial-authorities.shp --replace-existing
kart show

Produces

commit 1f00c236cc3fc6dd1458a21768aa699c80629315
Author: Hamish Campbell <hn.campbell@gmail.com>
Date:   Fri Feb 17 13:55:25 2023 +1300

    Import from territorial-authorities.shp:territorial-authorities to territorial-authorities/

--- territorial-authorities:meta:schema.json
+++ territorial-authorities:meta:schema.json
  [
    {
      "id": "bbd5a5f7-a0a4-4ab6-9b5e-cbe0f5510811",
      "name": "auto_pk",
      "dataType": "integer",
      "primaryKeyIndex": 0,
      "size": 64
    },
-   {
-     "id": "9a0f10b3-b6d5-4c60-8d05-bbdb7dfdfeda",
-     "name": "geom",
-     "dataType": "geometry",
-     "geometryType": "MULTIPOLYGON",
-     "geometryCRS": "EPSG:2193"
-   },
-   {
-     "id": "d5f7531c-70a4-4167-9d33-ab0b59d8a720",
-     "name": "id",
-     "dataType": "text",
-     "length": 254
-   },
-   {
-     "id": "e9a6c4c7-929c-4c31-975b-6909cd0706ee",
-     "name": "name",
-     "dataType": "text",
-     "length": 254
-   },
+   {
+     "id": "d82007e8-2bff-40ea-830a-a0c19f838166",
+     "name": "geom",
+     "dataType": "geometry",
+     "geometryType": "MULTIPOLYGON",
+     "geometryCRS": "EPSG:2193"
+   },
+   {
+     "id": "019475cf-a1ce-4cf8-a4d3-cb75f6bfe418",
+     "name": "id",
+     "dataType": "text",
+     "length": 254
+   },
+   {
+     "id": "2b5793aa-57b6-4548-b524-efec23261786",
+     "name": "name",
+     "dataType": "text",
+     "length": 254
+   },
  ]
--- territorial-authorities:feature:1
-                                  auto_pk = 1
-                                     geom = MULTIPOLYGON(...)
-                                       id = 025
-                                     name = Whakatane District
--- territorial-authorities:feature:2
-                                  auto_pk = 2
-                                     geom = MULTIPOLYGON(...)
-                                       id = 027
-                                     name = Ōpōtiki District
--- territorial-authorities:feature:3
-                                  auto_pk = 3
-                                     geom = MULTIPOLYGON(...)
-                                       id = 029
-                                     name = Wairoa District
- ....etc...
-

Version Info

» kart --version                                                                                     ~/Kart/test 130 ↵
Kart v0.12.2, Copyright (c) Kart Contributors
» GDAL v3.6.2; PROJ v9.1.1; PDAL v2.4.3
» PyGit2 v1.9.0; Libgit2 v1.4.2; Git v2.38.1; Git LFS v3.3.0
» SQLAlchemy v1.4.45; pysqlite3 v2.6.0/v3.40.0; SpatiaLite v5.0.1; Libpq v14.0.4
Executed via helper, PID: 15068