Less obtrusive sent icon for messages

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

@@ -1480,7 +1480,7 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
             // Line 3
             int icon = (message.drafts > 0
                     ? R.drawable.twotone_edit_24
-                    : EntityFolder.getIcon(outgoing ? EntityFolder.SENT : message.folderType));
+                    : (outgoing ? R.drawable.twotone_send_24_80 : EntityFolder.getIcon(message.folderType)));
             ivType.setVisibility(message.drafts > 0 ||
                     (viewType == ViewType.UNIFIED && type == null && (!inbox || outgoing)) ||
                     (viewType == ViewType.FOLDER && outgoing && !EntityFolder.SENT.equals(message.folderType)) ||

app/src/main/res/drawable/twotone_send_24_80.xml

@@ -0,0 +1,22 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:autoMirrored="true"
+    android:tint="?attr/colorControlNormal"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <group
+        android:scaleX="0.8"
+        android:scaleY="0.8"
+        android:translateX="2.4"
+        android:translateY="2.4">
+        <path
+            android:fillAlpha="0.3"
+            android:fillColor="@android:color/white"
+            android:pathData="M4,8.25l7.51,1 -7.5,-3.22zM4.01,17.97l7.5,-3.22 -7.51,1z"
+            android:strokeAlpha="0.3" />
+        <path
+            android:fillColor="@android:color/white"
+            android:pathData="M2.01,3L2,10l15,2 -15,2 0.01,7L23,12 2.01,3zM4,8.25L4,6.03l7.51,3.22 -7.51,-1zM4.01,17.97v-2.22l7.51,-1 -7.51,3.22z" />
+    </group>
+</vector>