fix: Obscured GutenbergKit block toolbar (#22304)

Custom IME handling is necessary to ensure the virtual keyboard does not
obscure the block toolbar. The previous `BaseAppCompatActivity` approach
worked for some devices, but not all. Namely, it did not work for the
Pixel 6 Pro.

Author: dcalhoun

WordPress/src/main/AndroidManifest.xml

@@ -307,7 +307,7 @@
         <activity
             android:name=".ui.posts.GutenbergKitActivity"
             android:configChanges="locale|screenLayout|orientation|screenSize|keyboard|keyboardHidden|smallestScreenSize|uiMode"
-            android:theme="@style/WordPress.NoActionBar.NoEdgeToEdge"
+            android:theme="@style/WordPress.NoActionBar"
             android:windowSoftInputMode="stateHidden|adjustResize"
             android:exported="false">
             <meta-data

WordPress/src/main/java/org/wordpress/android/ui/main/BaseAppCompatActivity.kt

@@ -28,6 +28,7 @@ import org.wordpress.android.ui.mysite.menu.MenuActivity
 import org.wordpress.android.ui.mysite.personalization.PersonalizationActivity
 import org.wordpress.android.ui.notifications.NotificationsDetailActivity
 import org.wordpress.android.ui.posts.EditPostActivity
+import org.wordpress.android.ui.posts.GutenbergKitActivity
 import org.wordpress.android.ui.posts.sharemessage.EditJetpackSocialShareMessageActivity
 import org.wordpress.android.ui.prefs.experimentalfeatures.ExperimentalFeaturesActivity
 import org.wordpress.android.ui.reader.ReaderCommentListActivity
@@ -114,4 +115,8 @@ private val excludedActivities = listOf(
     NotificationsDetailActivity::class.java.name,
     ReaderCommentListActivity::class.java.name,
     ReaderSubsActivity::class.java.name,
+
+    // these are excluded because they implement custom IME inset handling for proper
+    // keyboard management with edge-to-edge support
+    GutenbergKitActivity::class.java.name,
 )

WordPress/src/main/java/org/wordpress/android/ui/posts/GutenbergKitActivity.kt

@@ -33,6 +33,8 @@ import androidx.appcompat.widget.Toolbar
 import androidx.core.app.ActivityCompat
 import androidx.core.content.ContextCompat
 import androidx.core.util.Consumer
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.FragmentManager
 import androidx.fragment.app.FragmentPagerAdapter
@@ -490,6 +492,10 @@ class GutenbergKitActivity : BaseAppCompatActivity(), EditorImageSettingsListene
         }
 
         setContentView(R.layout.new_edit_post_activity)
+
+        // Handle edge-to-edge with IME insets for keyboard management
+        setupEdgeToEdgeWithImeInsets()
+
         backPressedCallback = object : OnBackPressedCallback(true) {
             override fun handleOnBackPressed() {
                 if (isModalDialogOpen) {
@@ -615,6 +621,30 @@ class GutenbergKitActivity : BaseAppCompatActivity(), EditorImageSettingsListene
         }
     }
 
+    /**
+     * Enables edge-to-edge display with proper IME (keyboard) inset handling.
+     * This ensures the editor toolbar remains visible above the keyboard on all devices.
+     */
+    private fun setupEdgeToEdgeWithImeInsets() {
+        val rootView = findViewById<View>(R.id.editor_activity)
+
+        ViewCompat.setOnApplyWindowInsetsListener(rootView) { view, insets ->
+            val systemBarsInsets = insets.getInsets(WindowInsetsCompat.Type.systemBars())
+            val imeInsets = insets.getInsets(WindowInsetsCompat.Type.ime())
+
+            // Apply system bar insets to keep content within safe areas
+            view.setPadding(
+                systemBarsInsets.left,
+                systemBarsInsets.top,
+                systemBarsInsets.right,
+                // Use IME insets for bottom padding when keyboard is visible, otherwise system bars
+                maxOf(systemBarsInsets.bottom, imeInsets.bottom)
+            )
+
+            WindowInsetsCompat.CONSUMED
+        }
+    }
+
     private fun initializeViewModels() {
         editPostNavigationViewModel = ViewModelProvider(this, viewModelFactory)[EditPostNavigationViewModel::class.java]
         editPostSettingsViewModel = ViewModelProvider(this, viewModelFactory)[EditPostSettingsViewModel::class.java]