Allow to resend temporary messages if the failure was not permissions

[nickvergessen]

Fix #2454

Also supports parallel errors much better now. If previous you would send each line as a message:

Lorem
ipsum
dolor
sit
amet

And they all failed e.g. due to network, you got "amet" recovered into the input while the rest is gone. Now you have to click on them one by one, but therefore can also recover them all.

[nickvergessen]

For testing I patched:

diff --git a/lib/Controller/ChatController.php b/lib/Controller/ChatController.php
index 9aecf0fbe..539d14188 100644
--- a/lib/Controller/ChatController.php
+++ b/lib/Controller/ChatController.php
@@ -165,6 +165,7 @@ class ChatController extends AEnvironmentAwareController {
         *         found".
         */
        public function sendMessage(string $message, string $actorDisplayName = '', string $referenceId = '', int $replyTo = 0): DataResponse {
+               sleep(7);
                if ($this->userId === null) {
                        $actorType = Attendee::ACTOR_GUESTS;
                        $sessionId = $this->session->getSessionForRoom($this->room->getToken());

and restarted apache in the meantime

[nickvergessen]

• @ma12-co can you turn the button in the retry-possible case into a correct button with 44px shade, etc.

[marcoambrosini]

I created a file in which to start to apply the new buttons styles with the goal to upstream it once it's ready

[nickvergessen]

Thanks, button works ✅ (can't approve as it's my PR)