Try to fix lint issues

Author: jmartinesp

vector/src/main/res/drawable/ic_composer_bullet_list.xml

@@ -128,11 +128,12 @@
         app:layout_constraintTop_toTopOf="@id/sendButton"
         app:layout_constraintStart_toEndOf="@id/attachmentButton"
         app:layout_constraintEnd_toStartOf="@id/sendButton"
-        app:layout_constraintBottom_toBottomOf="parent">
+        app:layout_constraintBottom_toBottomOf="parent"
+        android:fillViewport="true">
 
         <LinearLayout
             android:id="@+id/richTextMenu"
-            android:layout_width="match_parent"
+            android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:orientation="horizontal">
 

vector/src/main/res/drawable/ic_composer_numbered_list.xml

@@ -170,11 +170,12 @@
         app:layout_constraintTop_toTopOf="@id/sendButton"
         app:layout_constraintStart_toEndOf="@id/attachmentButton"
         app:layout_constraintEnd_toStartOf="@id/sendButton"
-        app:layout_constraintBottom_toBottomOf="parent">
+        app:layout_constraintBottom_toBottomOf="parent"
+        android:fillViewport="true">
 
         <LinearLayout
             android:id="@+id/richTextMenu"
-            android:layout_width="match_parent"
+            android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:orientation="horizontal">
 

vector/src/main/res/layout/composer_rich_text_layout.xml

@@ -182,11 +182,12 @@
         app:layout_constraintTop_toTopOf="@id/sendButton"
         app:layout_constraintStart_toEndOf="@id/attachmentButton"
         app:layout_constraintEnd_toStartOf="@id/sendButton"
-        app:layout_constraintBottom_toBottomOf="parent">
+        app:layout_constraintBottom_toBottomOf="parent"
+        android:fillViewport="true">
 
         <LinearLayout
             android:id="@+id/richTextMenu"
-            android:layout_width="match_parent"
+            android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:orientation="horizontal">
 

vector/src/main/res/layout/composer_rich_text_layout_constraint_set_compact.xml

@@ -3,6 +3,8 @@
     android:layout_width="48dp"
     android:layout_height="48dp"
     android:layout_marginHorizontal="2dp"
-    android:background="@android:color/transparent">
+    android:background="@android:color/transparent"
+    android:contentDescription="@string/app_name">
+    <!-- The contentDescription attr is populated programmatically. This is just to fix lint issues. -->
 
 </ImageButton>