fix PkgConfigDeps editable (#11440)

conan/tools/gnu/pkgconfigdeps/pc_files_templates.py

@@ -87,7 +87,7 @@ def _get_formatted_dirs(folders, prefix_path_):
 
 
 def get_pc_filename_and_content(conanfile, dep, name, requires, description, cpp_info=None):
-    package_folder = dep.package_folder
+    package_folder = dep.package_folder or ""  # If editable, package_folder can be None
     cpp_info = cpp_info or dep.cpp_info
     version = cpp_info.get_property("component_version") or dep.ref.version
 

conans/test/integration/toolchains/gnu/test_pkgconfigdeps.py

@@ -627,3 +627,32 @@ def build_requirements(self):
     client.run("install . -g PkgConfigDeps")
     assert "Description: Conan package: test" in client.load("test.pc")
     assert "Description: Conan package: app" in client.load("app.pc")
+
+
+def test_with_editable_layout():
+    """
+    https://github.com/conan-io/conan/issues/11435
+    """
+    client = TestClient()
+    dep = textwrap.dedent("""
+        from conan import ConanFile
+        from conan.tools.files import save
+        class Dep(ConanFile):
+            name = "dep"
+            version = "0.1"
+            def layout(self):
+                self.cpp.source.includedirs = ["include"]
+            def package_info(self):
+                self.cpp_info.libs = ["mylib"]
+        """)
+    client.save({"dep/conanfile.py": dep,
+                 "dep/include/header.h": "",
+                 "pkg/conanfile.py": GenConanfile("pkg", "0.1").with_requires("dep/0.1")})
+    client.run("create dep")
+    client.run("editable add dep dep/0.1")
+    with client.chdir("pkg"):
+        client.run("install . -g PkgConfigDeps")
+        pc = client.load("dep.pc")
+        assert "Libs: -lmylib" in pc
+        assert 'includedir1=' in pc
+        assert 'Cflags: -I"${includedir1}"' in pc