Closes #2789: Custom tabs is not covering the full screen size.

CHANGELOG.md

@@ -60,4 +60,5 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - #1994 - Made app state persist better when rotating the screen
 - #654 - Updated Refresh button to turn into Stop button while menu is open.
 - [AC #2725](https://github.com/mozilla-mobile/android-components/issues/2725) Updated tracking protectionPolicy to [recommend](https://github.com/mozilla-mobile/android-components/blob/master/components/concept/engine/src/main/java/mozilla/components/concept/engine/EngineSession.kt#L156)
+- #2789 Custom tabs is not covering the full screen size.
 ### Removed

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

@@ -162,14 +162,17 @@ class BrowserFragment : Fragment(), BackHandler, CoroutineScope {
             }
         }
 
-        view.engineView.asView().apply {
-            (layoutParams as CoordinatorLayout.LayoutParams).apply {
-                setMargins(
-                    0,
-                    0,
-                    0,
-                    (resources.displayMetrics.density * TOOLBAR_HEIGHT).toInt() +
-                        QUICK_ACTION_SHEET_HANDLE_HEIGHT)
+        if (customTabSessionId == null) {
+            view.engineView.asView().apply {
+                (layoutParams as CoordinatorLayout.LayoutParams).apply {
+                    setMargins(
+                        0,
+                        0,
+                        0,
+                        (resources.displayMetrics.density * TOOLBAR_HEIGHT).toInt() +
+                            QUICK_ACTION_SHEET_HANDLE_HEIGHT
+                    )
+                }
             }
         }