Extract checkbox selected mask (#14308)

app/src/main/java/org/mozilla/fenix/tabtray/FenixTabsAdapter.kt

@@ -8,6 +8,7 @@ import android.content.Context
 import android.view.LayoutInflater
 import android.view.View
 import androidx.core.view.isVisible
+import kotlinx.android.synthetic.main.checkbox_item.view.*
 import kotlinx.android.synthetic.main.tab_tray_item.view.*
 import mozilla.components.browser.tabstray.TabViewHolder
 import mozilla.components.browser.tabstray.TabsAdapter
@@ -104,7 +105,6 @@ class FenixTabsAdapter(
     private fun showCheckedIfSelected(tab: Tab, view: View) {
         val shouldBeChecked =
             mode is TabTrayDialogFragmentState.Mode.MultiSelect && selectedItems.contains(tab)
-        view.checkmark.isVisible = shouldBeChecked
         view.selected_mask.isVisible = shouldBeChecked
         view.mozac_browser_tabstray_close.isVisible = mode is TabTrayDialogFragmentState.Mode.Normal
     }

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

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?><!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/selected_mask"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@color/tab_tray_selected_mask_normal_theme"
+    android:visibility="gone"
+    tools:visibility="visible">
+
+    <ImageView
+        android:id="@+id/checkmark"
+        android:contentDescription="@string/tab_tray_multiselect_selected_content_description"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:background="@drawable/favicon_background"
+        android:backgroundTint="@color/accent_normal_theme"
+        android:elevation="1dp"
+        android:padding="8dp"
+        app:srcCompat="@drawable/mozac_ic_check" />
+</FrameLayout>

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

@@ -4,6 +4,7 @@
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/tab_item"
     android:layout_width="match_parent"
     android:layout_height="88dp"
@@ -51,25 +52,7 @@
             android:layout_height="match_parent"
             android:contentDescription="@string/mozac_browser_tabstray_open_tab" />
 
-        <View
-            android:id="@+id/selected_mask"
-            android:layout_width="match_parent"
-            android:layout_height="match_parent"
-            android:background="@color/tab_tray_selected_mask_normal_theme"
-            android:visibility="gone" />
-
-        <ImageView
-            android:id="@+id/checkmark"
-            android:contentDescription="@string/tab_tray_multiselect_selected_content_description"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:layout_gravity="center_horizontal|center_vertical"
-            android:background="@drawable/favicon_background"
-            android:backgroundTint="@color/accent_normal_theme"
-            android:elevation="1dp"
-            android:padding="10dp"
-            android:visibility="gone"
-            app:srcCompat="@drawable/mozac_ic_check" />
+        <include layout="@layout/checkbox_item" />
 
     </androidx.cardview.widget.CardView>
 
@@ -84,6 +67,7 @@
         android:paddingTop="22dp"
         android:textColor="@color/tab_tray_item_text_normal_theme"
         android:textSize="16sp"
+        tools:text="Firefox"
         app:layout_constraintEnd_toStartOf="@id/mozac_browser_tabstray_close"
         app:layout_constraintHorizontal_bias="0.0"
         app:layout_constraintStart_toEndOf="@id/mozac_browser_tabstray_card"
@@ -99,6 +83,7 @@
         android:paddingStart="16dp"
         android:textColor="@color/tab_tray_item_url_normal_theme"
         android:textSize="14sp"
+        tools:text="firefox.com"
         app:layout_constraintEnd_toStartOf="@id/mozac_browser_tabstray_close"
         app:layout_constraintHorizontal_bias="0.0"
         app:layout_constraintStart_toEndOf="@id/mozac_browser_tabstray_card"