Added bookmark legend

app/src/main/res/layout/fragment_legend_messages.xml

@@ -34,6 +34,29 @@
             app:layout_constraintStart_toEndOf="@id/ivThread"
             app:layout_constraintTop_toTopOf="@id/ivThread" />
 
+        <ImageView
+            android:id="@+id/ivBookmark"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:contentDescription="@string/title_legend_thread"
+            android:padding="12dp"
+            android:tint="?attr/colorAccent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/ivThread"
+            app:srcCompat="@drawable/baseline_message_24" />
+
+        <eu.faircode.email.FixedTextView
+            android:id="@+id/tvBookmark"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:gravity="center_vertical"
+            android:text="@string/title_legend_bookmark"
+            android:textAppearance="@style/TextAppearance.AppCompat.Medium"
+            app:layout_constraintBottom_toBottomOf="@id/ivBookmark"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toEndOf="@id/ivBookmark"
+            app:layout_constraintTop_toTopOf="@id/ivBookmark" />
+
         <ImageView
             android:id="@+id/ivZoom"
             android:layout_width="wrap_content"
@@ -41,7 +64,7 @@
             android:contentDescription="@string/title_legend_zoom"
             android:padding="12dp"
             app:layout_constraintStart_toStartOf="parent"
-            app:layout_constraintTop_toBottomOf="@id/ivThread"
+            app:layout_constraintTop_toBottomOf="@id/ivBookmark"
             app:srcCompat="@drawable/baseline_format_size_24" />
 
         <eu.faircode.email.FixedTextView

app/src/main/res/values/strings.xml

@@ -1179,6 +1179,7 @@
     <string name="title_legend_stop">Stop processing rules</string>
 
     <string name="title_legend_thread">Conversation</string>
+    <string name="title_legend_bookmark">Last opened conversation</string>
     <string name="title_legend_zoom">Change text size</string>
     <string name="title_legend_draft">Has draft</string>
     <string name="title_legend_priority">Has high priority</string>