Fixed lifecycle crashes

app/src/main/java/eu/faircode/email/FragmentCompose.java

@@ -76,6 +76,7 @@ import androidx.constraintlayout.widget.Group;
 import androidx.core.content.ContextCompat;
 import androidx.cursoradapter.widget.SimpleCursorAdapter;
 import androidx.fragment.app.FragmentTransaction;
+import androidx.lifecycle.Lifecycle;
 import androidx.lifecycle.Observer;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
@@ -799,7 +800,8 @@ public class FragmentCompose extends FragmentEx {
                 public void onChanged(final EntityMessage draft) {
                     // Draft was deleted
                     if (draft == null || draft.ui_hide) {
-                        getFragmentManager().popBackStack();
+                        if (getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.RESUMED))
+                            getFragmentManager().popBackStack();
                         return;
                     }
                 }

app/src/main/java/eu/faircode/email/FragmentFolder.java

@@ -33,6 +33,7 @@ import android.widget.Toast;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.lifecycle.Lifecycle;
 import androidx.lifecycle.Observer;
 
 public class FragmentFolder extends FragmentEx {
@@ -148,7 +149,8 @@ public class FragmentFolder extends FragmentEx {
             @Override
             public void onChanged(@Nullable EntityFolder folder) {
                 if (folder == null) {
-                    getFragmentManager().popBackStack();
+                    if (getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.RESUMED))
+                        getFragmentManager().popBackStack();
                     return;
                 }
 

app/src/main/java/eu/faircode/email/FragmentFolders.java

@@ -33,6 +33,7 @@ import java.util.List;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.constraintlayout.widget.Group;
+import androidx.lifecycle.Lifecycle;
 import androidx.lifecycle.Observer;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
@@ -108,7 +109,8 @@ public class FragmentFolders extends FragmentEx {
             @Override
             public void onChanged(@Nullable List<TupleFolderEx> folders) {
                 if (folders == null) {
-                    getFragmentManager().popBackStack();
+                    if (getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.RESUMED))
+                        getFragmentManager().popBackStack();
                     return;
                 }
 

app/src/main/java/eu/faircode/email/FragmentMessage.java

@@ -64,6 +64,7 @@ import androidx.browser.customtabs.CustomTabsIntent;
 import androidx.constraintlayout.widget.Group;
 import androidx.fragment.app.FragmentManager;
 import androidx.fragment.app.FragmentTransaction;
+import androidx.lifecycle.Lifecycle;
 import androidx.lifecycle.Observer;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
@@ -305,7 +306,7 @@ public class FragmentMessage extends FragmentEx {
             public void onChanged(@Nullable final TupleMessageEx message) {
                 if (message == null || (!(debug && BuildConfig.DEBUG) && message.ui_hide)) {
                     // Message gone (moved, deleted)
-                    if (FragmentMessage.this.isVisible())
+                    if (getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.RESUMED))
                         getFragmentManager().popBackStack();
                 } else {
                     setSubtitle(Helper.localizeFolderName(getContext(), message.folderName));

app/src/main/java/eu/faircode/email/FragmentMessages.java

@@ -40,6 +40,7 @@ import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.constraintlayout.widget.Group;
 import androidx.fragment.app.FragmentTransaction;
+import androidx.lifecycle.Lifecycle;
 import androidx.lifecycle.LiveData;
 import androidx.lifecycle.Observer;
 import androidx.paging.LivePagedListBuilder;
@@ -154,7 +155,8 @@ public class FragmentMessages extends FragmentEx {
             @Override
             public void onChanged(@Nullable PagedList<TupleMessageEx> messages) {
                 if (messages == null) {
-                    getFragmentManager().popBackStack();
+                    if (getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.RESUMED))
+                        getFragmentManager().popBackStack();
                     return;
                 }