For #6795 - Auto shows toolbar when loading a new URL (#6955)

Co-authored-by: Severin <Baron-Severin@users.noreply.github.com>

app/src/main/java/org/mozilla/fenix/browser/BaseBrowserFragment.kt

@@ -376,6 +376,18 @@ abstract class BaseBrowserFragment : Fragment(), UserInteractionHandler, Session
                 view = view
             )
 
+            session.register(observer = object : Session.Observer {
+                override fun onLoadRequest(
+                    session: Session,
+                    url: String,
+                    triggeredByRedirect: Boolean,
+                    triggeredByWebContent: Boolean
+                ): Boolean {
+                    browserToolbarView.expand()
+                    return false
+                }
+            }, owner = viewLifecycleOwner)
+
             @Suppress("ConstantConditionIf")
             if (FeatureFlags.pullToRefreshEnabled) {
                 val primaryTextColor =

app/src/main/java/org/mozilla/fenix/components/toolbar/BrowserToolbarView.kt

@@ -17,6 +17,7 @@ import androidx.core.view.isVisible
 import com.google.android.material.snackbar.Snackbar
 import kotlinx.android.extensions.LayoutContainer
 import kotlinx.android.synthetic.main.browser_toolbar_popup_window.view.*
+import kotlinx.android.synthetic.main.component_browser_top_toolbar.view.*
 import mozilla.components.browser.domains.autocomplete.ShippedDomainsProvider
 import mozilla.components.browser.session.Session
 import mozilla.components.browser.toolbar.BrowserToolbar
@@ -58,8 +59,10 @@ class BrowserToolbarView(
         else -> R.layout.component_browser_top_toolbar
     }
 
-    val view: BrowserToolbar = LayoutInflater.from(container.context)
+    private val layout = LayoutInflater.from(container.context)
         .inflate(toolbarLayout, container, true)
+
+    val view: BrowserToolbar = layout
         .findViewById(R.id.toolbar)
 
     val toolbarIntegration: ToolbarIntegration
@@ -216,6 +219,12 @@ class BrowserToolbarView(
         // Intentionally leaving this as a stub for now since we don't actually want to update currently
     }
 
+    fun expand() {
+        if (!settings.shouldUseBottomToolbar) {
+            layout.app_bar?.setExpanded(true)
+        }
+    }
+
     companion object {
         private const val TOOLBAR_ELEVATION = 16
     }

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

@@ -3,6 +3,7 @@
    - 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/. -->
 <com.google.android.material.appbar.AppBarLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/app_bar"
     android:layout_width="match_parent"
     android:layout_height="wrap_content">
 <mozilla.components.browser.toolbar.BrowserToolbar