hugolib: Fix IsTranslated for "old" node types

The new logic for creating Page objects from old node types
didn't include itself in the translation logic, so
`IsTranslated` returned falsely false for sites with only two languages.

The `AllTranslations` method also returned too few pages in that case.

This commit fixes that.

Fixes #2812

hugolib/hugo_sites.go

@@ -180,7 +180,7 @@ func (h *HugoSites) assignMissingTranslations() error {
 		// Assign translations
 		for _, t1 := range nodes {
 			for _, t2 := range nodes {
-				if t2.isNewTranslation(t1) {
+				if t1.isNewTranslation(t2) {
 					t1.translations = append(t1.translations, t2)
 				}
 			}

hugolib/hugo_sites_build_test.go

@@ -186,6 +186,49 @@ func assertFileContentRegexp(t *testing.T, filename string, defaultInSubDir bool
 	}
 }
 
+func TestMultiSitesWithTwoLanguages(t *testing.T) {
+	testCommonResetState()
+
+	viper.Set("defaultContentLanguage", "nn")
+
+	writeSource(t, "config.toml", `
+[languages]
+[languages.nn]
+languageName = "Nynorsk"
+weight = 1
+title = "Tittel på Nynorsk"
+
+[languages.en]
+title = "Title in English"
+languageName = "English"
+weight = 2
+`,
+	)
+
+	if err := LoadGlobalConfig("", "config.toml"); err != nil {
+		t.Fatalf("Failed to load config: %s", err)
+	}
+
+	// Add some data
+	writeSource(t, "data/hugo.toml", "slogan = \"Hugo Rocks!\"")
+
+	sites, err := NewHugoSitesFromConfiguration()
+
+	if err != nil {
+		t.Fatalf("Failed to create sites: %s", err)
+	}
+
+	require.NoError(t, sites.Build(BuildCfg{}))
+	require.Len(t, sites.Sites, 2)
+
+	nnSite := sites.Sites[0]
+	nnSiteHome := nnSite.getPage(KindHome)
+	require.Len(t, nnSiteHome.AllTranslations(), 2)
+	require.Len(t, nnSiteHome.Translations(), 1)
+	require.True(t, nnSiteHome.IsTranslated())
+
+}
+
 //
 func TestMultiSitesBuild(t *testing.T) {
 	for _, config := range []struct {

hugolib/page.go

@@ -1626,7 +1626,8 @@ func (p *Page) Lang() string {
 }
 
 func (p *Page) isNewTranslation(candidate *Page) bool {
-	if p == candidate || p.Kind != candidate.Kind {
+
+	if p.Kind != candidate.Kind {
 		return false
 	}
 
@@ -1634,10 +1635,6 @@ func (p *Page) isNewTranslation(candidate *Page) bool {
 		panic("Node type not currently supported for this op")
 	}
 
-	if p.language.Lang == candidate.language.Lang {
-		return false
-	}
-
 	// At this point, we know that this is a traditional Node (home page, section, taxonomy)
 	// It represents the same node, but different language, if the sections is the same.
 	if len(p.sections) != len(candidate.sections) {
@@ -1651,8 +1648,8 @@ func (p *Page) isNewTranslation(candidate *Page) bool {
 	}
 
 	// Finally check that it is not already added.
-	for _, translation := range candidate.translations {
-		if p == translation {
+	for _, translation := range p.translations {
+		if candidate == translation {
 			return false
 		}
 	}