repository: according to PEP 440 pre-releases should be considered "i…

…f the only available version that satisfies the version specifier is a pre-release" (no special handling of "*" constraint)

src/poetry/repositories/repository.py

@@ -50,9 +50,7 @@ def find_packages(self, dependency: Dependency) -> list[Package]:
                 and not allow_prereleases
                 and not package.is_direct_origin()
             ):
-                if constraint.is_any():
-                    # we need this when all versions of the package are pre-releases
-                    ignored_pre_release_packages.append(package)
+                ignored_pre_release_packages.append(package)
                 continue
 
             packages.append(package)

tests/repositories/test_legacy_repository.py

@@ -213,7 +213,7 @@ def test_find_packages_no_prereleases() -> None:
 
 
 @pytest.mark.parametrize(
-    ["constraint", "count"], [("*", 1), (">=1", 0), (">=19.0.0a0", 1)]
+    ["constraint", "count"], [("*", 1), (">=1", 1), ("<=18", 0), (">=19.0.0a0", 1)]
 )
 def test_find_packages_only_prereleases(constraint: str, count: int) -> None:
     repo = MockRepository()
@@ -228,13 +228,6 @@ def test_find_packages_only_prereleases(constraint: str, count: int) -> None:
             assert package.source_url == repo.url
 
 
-def test_find_packages_only_prereleases_empty_when_not_any() -> None:
-    repo = MockRepository()
-    packages = repo.find_packages(Factory.create_dependency("black", ">=1"))
-
-    assert len(packages) == 0
-
-
 @pytest.mark.parametrize(
     ["constraint", "expected"],
     [

tests/repositories/test_pypi_repository.py

@@ -87,7 +87,7 @@ def test_find_packages_does_not_select_prereleases_if_not_allowed() -> None:
 
 
 @pytest.mark.parametrize(
-    ["constraint", "count"], [("*", 1), (">=1", 0), (">=19.0.0a0", 1)]
+    ["constraint", "count"], [("*", 1), (">=1", 1), ("<=18", 0), (">=19.0.0a0", 1)]
 )
 def test_find_packages_only_prereleases(constraint: str, count: int) -> None:
     repo = MockRepository()