fix(ocfile): unsupported operation shares

app/src/main/java/com/owncloud/android/datamodel/OCFile.java

@@ -105,7 +105,7 @@ public class OCFile implements Parcelable, Comparable<OCFile>, ServerFileInterfa
     private String ownerId;
     private String ownerDisplayName;
     String note;
-    private List<ShareeUser> sharees;
+    private List<ShareeUser> sharees = new ArrayList<>();
     private String richWorkspace;
     private boolean locked;
     @Nullable
@@ -988,7 +988,7 @@ public void setNote(String note) {
     }
 
     public void setSharees(List<ShareeUser> sharees) {
-        this.sharees = sharees;
+        this.sharees = (sharees == null) ? new ArrayList<>() : new ArrayList<>(sharees);
     }
 
     public void setRichWorkspace(String richWorkspace) {

app/src/main/java/com/owncloud/android/ui/adapter/OCFileListAdapter.java

@@ -1,6 +1,7 @@
 /*
  * Nextcloud - Android Client
  *
+ * SPDX-FileCopyrightText: 2026 Alper Ozturk <alper.ozturk@nextcloud.com>
  * SPDX-FileCopyrightText: 2023 TSI-mc
  * SPDX-FileCopyrightText: 2020 Chris Narkiewicz <hello@ezaquarii.com>
  * SPDX-FileCopyrightText: 2018 Tobias Kaminsky <tobias@kaminsky.me>
@@ -75,7 +76,6 @@
 import java.io.File;
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
-import java.util.Collections;
 import java.util.Date;
 import java.util.List;
 import java.util.Locale;
@@ -594,29 +594,44 @@ private void handleListMode(ListGridItemViewHolder holder,
     }
 
     private void bindSharedAvatars(ListItemViewHolder holder, OCFile file) {
+        final var sharedAvatars = holder.getSharedAvatars();
+
         if (!(file.isSharedWithMe() || file.isSharedWithSharee()) || isMultiSelect() || gridView || hideItemOptions) {
-            holder.getSharedAvatars().setVisibility(View.GONE);
-            holder.getSharedAvatars().removeAllViews();
+            sharedAvatars.setVisibility(View.GONE);
+            if (sharedAvatars.getChildCount() > 0) {
+                sharedAvatars.removeAllViews();
+            }
             return;
         }
 
-        final var sharees = new ArrayList<>(file.getSharees());
+        sharedAvatars.setVisibility(View.VISIBLE);
+        sharedAvatars.setAvatars(user, avatarSharees(file), viewThemeUtils);
+        sharedAvatars.setOnClickListener(view -> ocFileListFragmentInterface.onShareIconClick(file));
+    }
+
+    private List<ShareeUser> avatarSharees(OCFile file) {
+        final List<ShareeUser> sharees = file.getSharees();
 
+        ShareeUser owner = null;
         final String ownerId = file.getOwnerId();
         if (!TextUtils.isEmpty(ownerId) && !ownerId.equals(userId)) {
             final var ownerSharee = new ShareeUser(ownerId, file.getOwnerDisplayName(), ShareType.USER);
             if (!sharees.contains(ownerSharee)) {
-                sharees.add(ownerSharee);
+                owner = ownerSharee;
             }
         }
 
-        Collections.reverse(sharees);
+        final var ordered = new ArrayList<ShareeUser>(sharees.size() + (owner == null ? 0 : 1));
+        if (owner != null) {
+            ordered.add(owner);
+        }
 
-        final var sharedAvatars = holder.getSharedAvatars();
-        sharedAvatars.setVisibility(View.VISIBLE);
-        sharedAvatars.removeAllViews();
-        sharedAvatars.setAvatars(user, sharees, viewThemeUtils);
-        sharedAvatars.setOnClickListener(view -> ocFileListFragmentInterface.onShareIconClick(file));
+        // count from last to first to get desired order
+        for (int i = sharees.size() - 1; i >= 0; i--) {
+            ordered.add(sharees.get(i));
+        }
+
+        return ordered;
     }
 
     private void bindListItemViewHolder(ListItemViewHolder holder, OCFile file) {

app/src/test/java/com/owncloud/android/datamodel/OCFileTest.kt

@@ -1,17 +1,41 @@
 /*
  * Nextcloud - Android Client
  *
+ * SPDX-FileCopyrightText: 2026 Alper Ozturk <alper.ozturk@nextcloud.com>
  * SPDX-FileCopyrightText: 2022 Tobias Kaminsky <tobias@kaminsky.me>
  * SPDX-FileCopyrightText: 2022 Nextcloud GmbH
  * SPDX-License-Identifier: AGPL-3.0-or-later OR GPL-2.0-only
  */
 package com.owncloud.android.datamodel
 
+import com.owncloud.android.lib.resources.shares.ShareType
+import com.owncloud.android.lib.resources.shares.ShareeUser
 import org.junit.Assert.assertEquals
 import org.junit.Assert.assertNotEquals
+import org.junit.Assert.assertTrue
 import org.junit.Test
 
 class OCFileTest {
+    @Test
+    fun testShareesDefaultsToEmptyMutableList() {
+        val sut = OCFile("/")
+
+        assertTrue(sut.sharees.isEmpty())
+
+        sut.sharees.add(ShareeUser("alice", "Alice", ShareType.USER))
+        assertEquals(1, sut.sharees.size)
+    }
+
+    @Test
+    fun testShareesStayMutableWhenSetFromImmutableList() {
+        val sut = OCFile("/")
+
+        sut.sharees = listOf(ShareeUser("alice", "Alice", ShareType.USER))
+
+        sut.sharees.add(ShareeUser("bob", "Bob", ShareType.USER))
+        assertEquals(2, sut.sharees.size)
+    }
+
     @Test
     fun testLongIds() {
         val sut = OCFile("/")