Make imageConfig work with modules

Fixes #11205

tpl/images/integration_test.go

@@ -0,0 +1,56 @@
+// Copyright 2023 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package images_test
+
+import (
+	"testing"
+
+	"github.com/gohugoio/hugo/hugolib"
+)
+
+func TestImageConfigFromModule(t *testing.T) {
+	t.Parallel()
+
+	files := `
+-- hugo.toml --
+baseURL = 'http://example.com/'
+theme = ["mytheme"]
+-- static/images/pixel1.png --
+iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNkYPhfDwAChwGA60e6kgAAAABJRU5ErkJggg==
+-- themes/mytheme/static/images/pixel2.png --
+iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNkYPhfDwAChwGA60e6kgAAAABJRU5ErkJggg==
+-- layouts/index.html --
+{{ $path := "static/images/pixel1.png" }}
+fileExists OK: {{ fileExists $path }}|
+imageConfig OK: {{ (imageConfig $path).Width }}|
+{{ $path2 := "static/images/pixel2.png" }}
+fileExists2 OK: {{ fileExists $path2 }}|
+imageConfig2 OK: {{ (imageConfig $path2).Width }}|
+
+  `
+
+	b := hugolib.NewIntegrationTestBuilder(
+		hugolib.IntegrationTestConfig{
+			T:           t,
+			TxtarString: files,
+		},
+	).Build()
+
+	b.AssertFileContent("public/index.html", `
+fileExists OK: true|
+imageConfig OK: 1|
+fileExists2 OK: true|
+imageConfig2 OK: 1|
+`)
+}