Activate linting for touched files

.github/workflows/tox.yml

@@ -97,6 +97,5 @@ jobs:
           tox -e format-check
 
       - name: Run ruff lint
-        continue-on-error: true # deactivate for now (need to fix the issues over time)
         run: |
           tox -e lint

tox.ini

@@ -4,7 +4,7 @@ isolated_build = True
 # python 3.11 and 3.12 test ok on Linux but fail on Windows due to Pillow
 # Currently used Pillow 9.0.1 only supports Python 3.10 according to
 # https://pillow.readthedocs.io/en/latest/installation.html#python-support
-envlist = py{38,39,310,311,312}, docs, black
+envlist = py{38,39,310,311,312}, docs, lint, format-check
 
 [testenv]
 allowlist_externals = poetry
@@ -36,7 +36,8 @@ basepython = python3.12
 commands=
     poetry install --no-root
     poetry run ruff format --check {[testenv]py_folders}
-    poetry run ruff {[testenv]py_folders}
+    # extend the file list once a file is touched so lint issues get fixed over time
+    poetry run ruff tests/conftest.py tests/test_rects.py
 
 [testenv:format-check]
 envdir = {toxworkdir}/py312