Fixes #4192: Private keyboard in private browsing (#4345)

Sets compliant keyboards to private mode when in private browsing.

CHANGELOG.md

@@ -76,5 +76,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - #3750 - Crash when tapping "Blocked" on Google Maps after disabling location requests
 - #2945 - Fixed "Launches to blank screen and hangs on Nexus 10"
 - #3869 - Creates a SearchLocalizationProvider that sets the region to get the correct default search engine based on a locale
+- #4192 - Sets keyboard to private mode in private browsing
 - #2142 - Fixed "When launching Fenix, Enable private browsing button is focused instead of Search or address"
 ### Removed

app/src/main/java/org/mozilla/fenix/search/SearchFragment.kt

@@ -89,8 +89,13 @@ class SearchFragment : Fragment(), BackHandler {
             searchStore
         )
 
-        toolbarView = ToolbarView(view.toolbar_component_wrapper, searchInteractor, historyStorageProvider())
         awesomeBarView = AwesomeBarView(view.search_layout, searchInteractor)
+        toolbarView = ToolbarView(
+            view.toolbar_component_wrapper,
+            searchInteractor,
+            historyStorageProvider(),
+            (activity as HomeActivity).browsingModeManager.isPrivate
+        )
 
         return view
     }

app/src/main/java/org/mozilla/fenix/search/toolbar/ToolbarView.kt

@@ -49,7 +49,8 @@ interface ToolbarInteractor {
 class ToolbarView(
     private val container: ViewGroup,
     private val interactor: ToolbarInteractor,
-    private val historyStorage: HistoryStorage?
+    private val historyStorage: HistoryStorage?,
+    private val isPrivate: Boolean
 ) : LayoutContainer {
 
     override val containerView: View?
@@ -87,6 +88,8 @@ class ToolbarView(
                 R.color.suggestion_highlight_color
             )
 
+            private = isPrivate
+
             setOnEditListener(object : mozilla.components.concept.toolbar.Toolbar.OnEditListener {
                 override fun onCancelEditing(): Boolean {
                     interactor.onEditingCanceled()