Manually merge from 'pre-kjol' into 'master'

go/jsbundler/faicons.go

@@ -119,6 +119,15 @@ func generateFAIcons() error {
 	}
 	b.WriteString("};\n")
 
+	// Skip the write when content is unchanged so the file's mtime doesn't
+	// advance on every SPA source edit — the dev watcher treats any mtime bump
+	// as a real change and hot-reloads Icons.tsx (the nearest HMR boundary that
+	// imports this file), which is wasteful when nothing about the icon set
+	// actually changed.
+	if existing, err := os.ReadFile(faOutPath()); err == nil && string(existing) == b.String() {
+		return nil
+	}
+
 	if err := os.MkdirAll(filepath.Dir(faOutPath()), 0755); err != nil {
 		return err
 	}