Show send errors in message lists

app/src/main/java/eu/faircode/email/DaoMessage.java

@@ -245,11 +245,12 @@ public interface DaoMessage {
             boolean filter_archive,
             boolean ascending, boolean debug);
 
-    @Query("SELECT COUNT(*) FROM message" +
+    @Query("SELECT COUNT(*) AS pending, SUM(message.error IS NOT NULL) AS errors" +
+            " FROM message" +
             " JOIN folder_view AS folder ON folder.id = message.folder" +
             " WHERE " + is_outbox +
-            " AND NOT ui_snoozed IS NULL")
-    LiveData<Integer> liveOutboxPending();
+            " AND (NOT message.ui_snoozed IS NULL OR message.error IS NOT NULL)")
+    LiveData<TupleOutboxStats> liveOutboxPending();
 
     @Query("SELECT account.name AS accountName" +
             ", COUNT(message.id) AS count" +

app/src/main/java/eu/faircode/email/FragmentMessages.java

@@ -314,6 +314,8 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
 
     private int colorPrimary;
     private int colorAccent;
+    private int colorSeparator;
+    private int colorWarning;
 
     private long primary;
     private boolean connected;
@@ -431,6 +433,8 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
 
         colorPrimary = Helper.resolveColor(getContext(), R.attr.colorPrimary);
         colorAccent = Helper.resolveColor(getContext(), R.attr.colorAccent);
+        colorSeparator = Helper.resolveColor(getContext(), R.attr.colorSeparator);
+        colorWarning = Helper.resolveColor(getContext(), R.attr.colorWarning);
 
         if (criteria == null)
             if (thread == null) {
@@ -3998,16 +4002,26 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
                 break;
         }
 
-        if (send_pending &&
-                (viewType == AdapterMessage.ViewType.UNIFIED || viewType == AdapterMessage.ViewType.FOLDER))
-            db.message().liveOutboxPending().observe(getViewLifecycleOwner(), new Observer<Integer>() {
+        if (!EntityFolder.OUTBOX.equals(type) &&
+                (viewType == AdapterMessage.ViewType.UNIFIED ||
+                        viewType == AdapterMessage.ViewType.FOLDER))
+            db.message().liveOutboxPending().observe(getViewLifecycleOwner(), new Observer<TupleOutboxStats>() {
                 @Override
-                public void onChanged(Integer pending) {
-                    if (pending != null && pending > 10)
+                public void onChanged(TupleOutboxStats stats) {
+                    int pending = (stats == null || stats.pending == null ? 0 : stats.pending);
+                    int errors = (stats == null || stats.errors == null ? 0 : stats.errors);
+
+                    int count = (send_pending ? pending : errors);
+                    if (count > 10)
                         tvOutboxCount.setText("+");
                     else
-                        tvOutboxCount.setText(pending == null || pending == 0 ? null : NF.format(pending));
-                    grpOutbox.setVisibility(pending == null || pending == 0 ? View.GONE : View.VISIBLE);
+                        tvOutboxCount.setText(count == 0 ? null : NF.format(count));
+
+                    int color = (errors == 0 ? colorSeparator : colorWarning);
+                    ibOutbox.setImageTintList(ColorStateList.valueOf(color));
+                    tvOutboxCount.setTextColor(color);
+
+                    grpOutbox.setVisibility(count == 0 ? View.GONE : View.VISIBLE);
                 }
             });
 

app/src/main/java/eu/faircode/email/TupleOutboxStats.java

@@ -0,0 +1,25 @@
+package eu.faircode.email;
+
+/*
+    This file is part of FairEmail.
+
+    FairEmail is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    FairEmail is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with FairEmail.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2018-2021 by Marcel Bokhorst (M66B)
+*/
+
+public class TupleOutboxStats {
+    Integer pending;
+    Integer errors;
+}