Merge branch 'ui-fixes' into 'master'

Small UI fixes

See merge request briar/briar!975

briar-android/src/main/res/layout/list_item_conversation_msg_in.xml

@@ -23,6 +23,8 @@
 		android:textColor="?android:attr/textColorPrimary"
 		app:layout_constraintBottom_toTopOf="@+id/time"
 		app:layout_constraintEnd_toEndOf="@+id/time"
+		app:layout_constraintHorizontal_bias="0.0"
+		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
 		tools:text="Short message"/>
 
@@ -33,6 +35,8 @@
 		android:layout_height="wrap_content"
 		app:layout_constraintBottom_toBottomOf="parent"
 		app:layout_constraintEnd_toEndOf="parent"
+		app:layout_constraintHorizontal_bias="1.0"
+		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toBottomOf="@+id/text"
 		tools:text="Dec 24, 13:37"/>
 

briar-android/src/main/res/layout/list_item_group_join_notice.xml

@@ -5,7 +5,8 @@
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
-	android:layout_height="wrap_content">
+	android:layout_height="wrap_content"
+	android:background="@drawable/list_item_thread_background">
 
 	<com.vanniktech.emoji.EmojiTextView
 		android:id="@+id/text"
@@ -24,8 +25,8 @@
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
 		android:layout_margin="@dimen/margin_medium"
-		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintEnd_toEndOf="parent"
+		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toBottomOf="@+id/text"
 		app:persona="commenter"/>
 

briar-android/src/main/res/layout/list_item_selectable_contact.xml

@@ -35,6 +35,7 @@
 		app:layout_constraintStart_toEndOf="@+id/avatarView"
 		app:layout_constraintTop_toTopOf="parent"
 		app:layout_constraintVertical_chainStyle="packed"
+		app:layout_goneMarginBottom="@dimen/listitem_horizontal_margin"
 		tools:text="This is a name of a contact with a long name"/>
 
 	<TextView