Revert "Intercept back pressed events: to expand the app bar layout if needed, instead of exiting the app."

This reverts commit ea0264a.

Author: caarmen

Diff for: app/src/main/kotlin/ca/rmen/android/poetassistant/main/MainActivity.kt

@@ -39,7 +39,6 @@ import android.view.MenuItem
 import android.view.Window
 import android.view.WindowManager
 import android.view.inputmethod.InputMethodManager
-import androidx.activity.OnBackPressedCallback
 import androidx.core.view.updatePadding
 import androidx.lifecycle.ViewModelProvider
 import ca.rmen.android.poetassistant.BuildConfig
@@ -136,15 +135,6 @@ class MainActivity : AppCompatActivity(), OnWordClickListener, WarningNoSpaceDia
                 top = insets.top,
             )
         }
-        onBackPressedDispatcher.addCallback(this, object : OnBackPressedCallback(true) {
-            override fun handleOnBackPressed() {
-                if (mBinding.appBarLayout.top < 0) {
-                    mBinding.appBarLayout.setExpanded(true, true)
-                } else {
-                    finish()
-                }
-            }
-        })
         val searchView = mBinding.searchView
         val suggestionsViewModel = ViewModelProvider(this).get(SuggestionsViewModel::class.java)
         mSearch.setSearchView(searchView, suggestionsViewModel)