Allow zero width space in the middle of text.

Fixes #6959.

Telegram/SourceFiles/chat_helpers/message_field.cpp

@@ -431,10 +431,7 @@ bool HasSendText(not_null<const Ui::InputField*> field) {
 	const auto &text = field->getTextWithTags().text;
 	for (const auto &ch : text) {
 		const auto code = ch.unicode();
-		if (code != ' '
-			&& code != '\n'
-			&& code != '\r'
-			&& !IsReplacedBySpace(code)) {
+		if (!IsTrimmed(ch) && !IsReplacedBySpace(code)) {
 			return true;
 		}
 	}

Telegram/lib_ui

@@ -1 +1 @@
-Subproject commit 34fcd4981d764f0869793893f37822b9c09393ab
+Subproject commit a48b3d3750ac1a1e3b2f4da3494fa5fb23b66106