[Glitch] Quote Posts: Add notifications for DMs and private posts

Port 5bae08d1ff to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/features/ui/components/visibility_modal.tsx

@@ -128,9 +128,12 @@ export const VisibilityModal: FC<VisibilityModalProps> = forwardRef(
     const disableVisibility = !!statusId;
     const disableQuotePolicy =
       visibility === 'private' || visibility === 'direct';
-    const disablePublicVisibilities: boolean = useAppSelector(
+    const disablePublicVisibilities = useAppSelector(
       selectDisablePublicVisibilities,
     );
+    const isQuotePost = useAppSelector(
+      (state) => state.compose.get('quoted_status_id') !== null,
+    );
 
     const visibilityItems = useMemo<SelectItem<StatusVisibility>[]>(() => {
       const items: SelectItem<StatusVisibility>[] = [
@@ -315,6 +318,21 @@ export const VisibilityModal: FC<VisibilityModalProps> = forwardRef(
                 id={quoteDescriptionId}
               />
             </div>
+
+            {isQuotePost && visibility === 'direct' && (
+              <div className='visibility-modal__quote-warning'>
+                <FormattedMessage
+                  id='visibility_modal.direct_quote_warning.title'
+                  defaultMessage="Quotes can't be embedded in private mentions"
+                  tagName='h3'
+                />
+                <FormattedMessage
+                  id='visibility_modal.direct_quote_warning.text'
+                  defaultMessage='If you save the current settings, the embedded quote will be converted to a link.'
+                  tagName='p'
+                />
+              </div>
+            )}
           </div>
           <div className='dialog-modal__content__actions'>
             <Button onClick={onClose} secondary>