For #19739 - Adds start tabsTray with multiSelect support

app/src/main/java/org/mozilla/fenix/tabstray/TabsTrayFragment.kt

@@ -17,6 +17,7 @@ import androidx.core.view.isVisible
 import androidx.fragment.app.activityViewModels
 import androidx.lifecycle.lifecycleScope
 import androidx.navigation.fragment.findNavController
+import androidx.navigation.fragment.navArgs
 import com.google.android.material.bottomsheet.BottomSheetBehavior
 import com.google.android.material.tabs.TabLayout
 import kotlinx.android.synthetic.main.component_tabstray2.*
@@ -87,7 +88,20 @@ class TabsTrayFragment : AppCompatDialogFragment() {
         val containerView = inflater.inflate(R.layout.fragment_tab_tray_dialog, container, false)
         inflater.inflate(R.layout.component_tabstray2, containerView as ViewGroup, true)
 
-        tabsTrayStore = StoreProvider.get(this) { TabsTrayStore() }
+        val args by navArgs<TabsTrayFragmentArgs>()
+        val initialMode = if (args.enterMultiselect) {
+            TabsTrayState.Mode.Select(emptySet())
+        } else {
+            TabsTrayState.Mode.Normal
+        }
+
+        tabsTrayStore = StoreProvider.get(this) {
+            TabsTrayStore(
+                initialState = TabsTrayState(
+                    mode = initialMode
+                )
+            )
+        }
 
         fabView = LayoutInflater.from(containerView.context)
             .inflate(R.layout.component_tabstray_fab, containerView, true)

app/src/main/java/org/mozilla/fenix/tabstray/browser/SelectionBannerBinding.kt

@@ -15,7 +15,6 @@ import kotlinx.android.synthetic.main.tabstray_multiselect_items.view.*
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.collect
-import kotlinx.coroutines.flow.drop
 import kotlinx.coroutines.flow.map
 import mozilla.components.lib.state.helpers.AbstractBinding
 import mozilla.components.support.ktx.kotlinx.coroutines.flow.ifChanged
@@ -70,8 +69,6 @@ class SelectionBannerBinding(
 
     override suspend fun onState(flow: Flow<TabsTrayState>) {
         flow.map { it.mode }
-            // ignore initial mode update; we never start in select mode.
-            .drop(1)
             .ifChanged()
             .collect { mode ->
                 val isSelectMode = mode is Select

app/src/main/java/org/mozilla/fenix/tabstray/browser/SelectionHandleBinding.kt

@@ -13,7 +13,6 @@ import androidx.core.view.updateLayoutParams
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.collect
-import kotlinx.coroutines.flow.drop
 import kotlinx.coroutines.flow.map
 import mozilla.components.lib.state.helpers.AbstractBinding
 import mozilla.components.support.ktx.kotlinx.coroutines.flow.ifChanged
@@ -43,8 +42,6 @@ class SelectionHandleBinding(
 
     override suspend fun onState(flow: Flow<TabsTrayState>) {
         flow.map { it.mode }
-            // ignore initial mode update; we never start in select mode.
-            .drop(1)
             .ifChanged()
             .collect { mode ->
                 val isSelectMode = mode is Mode.Select