compose_box: Wait for send message request to complete.

assets/l10n/app_en.arb

@@ -169,6 +169,10 @@
   "@errorQuotationFailed": {
     "description": "Error message when quoting a message failed."
   },
+  "errorSendMessageTimeout": "Your message was not sent. Check your connection.",
+  "@errorSendMessageTimeout": {
+    "description": "Error message when failed to send a message due to timeout."
+  },
   "errorServerMessage": "The server said:\n\n{message}",
   "@errorServerMessage": {
     "description": "Error message that quotes an error from the server.",

lib/generated/l10n/zulip_localizations.dart

@@ -325,6 +325,12 @@ abstract class ZulipLocalizations {
   /// **'Quotation failed'**
   String get errorQuotationFailed;
 
+  /// Error message when failed to send a message due to timeout.
+  ///
+  /// In en, this message translates to:
+  /// **'Your message was not sent. Check your connection.'**
+  String get errorSendMessageTimeout;
+
   /// Error message that quotes an error from the server.
   ///
   /// In en, this message translates to:

lib/generated/l10n/zulip_localizations_ar.dart

@@ -144,6 +144,9 @@ class ZulipLocalizationsAr extends ZulipLocalizations {
   @override
   String get errorQuotationFailed => 'Quotation failed';
 
+  @override
+  String get errorSendMessageTimeout => 'Your message was not sent. Check your connection.';
+
   @override
   String errorServerMessage(String message) {
     return 'The server said:\n\n$message';

lib/generated/l10n/zulip_localizations_en.dart

@@ -144,6 +144,9 @@ class ZulipLocalizationsEn extends ZulipLocalizations {
   @override
   String get errorQuotationFailed => 'Quotation failed';
 
+  @override
+  String get errorSendMessageTimeout => 'Your message was not sent. Check your connection.';
+
   @override
   String errorServerMessage(String message) {
     return 'The server said:\n\n$message';

lib/generated/l10n/zulip_localizations_ja.dart

@@ -144,6 +144,9 @@ class ZulipLocalizationsJa extends ZulipLocalizations {
   @override
   String get errorQuotationFailed => 'Quotation failed';
 
+  @override
+  String get errorSendMessageTimeout => 'Your message was not sent. Check your connection.';
+
   @override
   String errorServerMessage(String message) {
     return 'The server said:\n\n$message';