feat(ui): add updateDescription flag to toast API

If false, when updating a toast, the description is left alone. The count will still tick up.

invokeai/frontend/web/src/features/toast/toast.ts

@@ -22,6 +22,18 @@ type ToastArg = ToastConfig & {
    * // second toast: 'Hello (2)'
    */
   withCount?: boolean;
+  /**
+   * Whether to update the description when updating the toast. Defaults to true.
+   * @example
+   * // updateDescription: true
+   * toast({ title: 'Hello', description: 'Foo' }); // Foo
+   * toast({ title: 'Hello', description: 'Bar' }); // Bar
+   * @example
+   * // updateDescription: false
+   * toast({ title: 'Hello', description: 'Foo' }); // Foo
+   * toast({ title: 'Hello', description: 'Bar' }); // Foo
+   */
+  updateDescription?: boolean;
 };
 
 type ToastInternalState = {
@@ -48,6 +60,7 @@ const getGetState = (id: string) => () => $toastMap.get()[id] ?? null;
 /**
  * Creates a toast with the given config. If the toast with the same id already exists, it will be updated.
  * When a toast is updated, its title, description, status and duration will be overwritten by the new config.
+ * Use `updateDescription: false` to keep the description when updating.
  * Set duration to `null` to make the toast persistent.
  * @param arg The toast config.
  * @returns An object with methods to get the toast state, close the toast and check if the toast is active
@@ -61,17 +74,20 @@ export const toast = (arg: ToastArg): ToastApi => {
   if (arg.withCount === undefined) {
     arg.withCount = true;
   }
+  if (arg.updateDescription === undefined) {
+    arg.updateDescription = true;
+  }
   let state = $toastMap.get()[arg.id];
   if (!state) {
     // First time caller, create and set the state
-    state = { id, config: parseConfig(id, arg, 1), count: 1 };
+    state = { id, config: parseConfig(null, id, arg, 1), count: 1 };
     $toastMap.setKey(id, state);
     // Create the toast
     toastApi(state.config);
   } else {
     // This toast is already active, update its state
     state.count += 1;
-    state.config = parseConfig(id, arg, state.count);
+    state.config = parseConfig(state, id, arg, state.count);
     $toastMap.setKey(id, state);
     // Update the toast itself
     toastApi.update(id, state.config);
@@ -81,18 +97,26 @@ export const toast = (arg: ToastArg): ToastApi => {
 
 /**
  * Give a toast id, arg and current count, returns the parsed toast config (including dynamic title and description)
+ * @param state The current state of the toast or null if it doesn't exist
  * @param id The id of the toast
  * @param arg The arg passed to the toast function
  * @param count The current call count of the toast
  * @returns The parsed toast config
  */
-const parseConfig = (id: string, arg: ToastArg, count: number): ToastConfig => {
+const parseConfig = (state: ToastInternalState | null, id: string, arg: ToastArg, count: number): ToastConfig => {
-  const title = arg.withCount && count > 1 ? `${arg.title} (${count})` : arg.title;
   const onCloseComplete = () => {
     $toastMap.setKey(id, undefined);
     if (arg.onCloseComplete) {
       arg.onCloseComplete();
     }
   };
-  return { ...arg, title, onCloseComplete };
+  const title = arg.withCount && count > 1 ? `${arg.title} (${count})` : arg.title;
+  const description = !arg.updateDescription && state ? state.config.description : arg.description;
+  const config: ToastConfig = {
+    ...arg,
+    title,
+    description,
+    onCloseComplete,
+  };
+  return config;
 };