allow previews in config_subentries_flow (#25859)

Author: iluvdata

src/data/preview.ts

@@ -13,7 +13,7 @@ export const subscribePreviewGeneric = (
   hass: HomeAssistant,
   domain: string,
   flow_id: string,
-  flow_type: "config_flow" | "options_flow",
+  flow_type: "config_flow" | "options_flow" | "config_subentries_flow",
   user_input: Record<string, any>,
   callback: (preview: GenericPreview) => void
 ): Promise<UnsubscribeFunc> =>

src/dialogs/config-flow/previews/flow-preview-generic.ts

@@ -82,7 +82,11 @@ export class FlowPreviewGeneric extends LitElement {
       (await this._unsub)();
       this._unsub = undefined;
     }
-    if (this.flowType !== "config_flow" && this.flowType !== "options_flow") {
+    if (
+      this.flowType !== "config_flow" &&
+      this.flowType !== "options_flow" &&
+      this.flowType !== "config_subentries_flow"
+    ) {
       return;
     }
     this._error = undefined;