POP3 cannot create folders

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

@@ -187,6 +187,12 @@ public class FragmentFolders extends FragmentBase {
         fabAdd.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
+                Boolean pop = (Boolean) v.getTag();
+                if (pop != null && pop) {
+                    ToastEx.makeText(v.getContext(), R.string.title_pop_folders, Toast.LENGTH_LONG).show();
+                    return;
+                }
+
                 Bundle args = new Bundle();
                 args.putLong("account", account);
                 FragmentFolder fragment = new FragmentFolder();
@@ -291,11 +297,13 @@ public class FragmentFolders extends FragmentBase {
                     else
                         fabError.hide();
 
-                    if (account == null || !imap || primary)
+                    if (account == null || primary)
                         fabAdd.hide();
-                    else
+                    else {
+                        fabAdd.setTag(!imap);
                         fabAdd.show();
                     }
+                }
             });
 
         // Observe folders

app/src/main/res/values/strings.xml

@@ -758,6 +758,7 @@
     <string name="title_storage_quota">Server storage usage: %1$s/%2$s</string>
     <string name="title_pop_support">The POP3 protocol supports downloading and deleting messages from the inbox only. POP3 cannot mark messages as read, move messages, etc. POP3 will use more battery power and data than IMAP. So, consider using the IMAP protocol whenever possible.</string>
     <string name="title_pop_warning">If a POP3 server does not support the UIDL command, the data usage might be high. So, adjust the poll frequency below accordingly.</string>
+    <string name="title_pop_folders">The POP3 protocol does not support creating folders</string>
     <string name="title_oauth_support">OAuth is not supported</string>
     <string name="title_review">Review</string>
     <string name="title_hint_alias">Long press an identity to display options, like copy to create alias identities</string>