Added setting to disable language detection

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

@@ -48,6 +48,7 @@ public class FragmentOptionsBehavior extends FragmentBase implements SharedPrefe
     private SwitchCompat swDoubleBack;
     private SwitchCompat swConversationActions;
     private SwitchCompat swConversationActionsReplies;
+    private SwitchCompat swLanguageDetection;
     private EditText etDefaultSnooze;
     private SwitchCompat swPull;
     private SwitchCompat swAutoScroll;
@@ -72,7 +73,8 @@ public class FragmentOptionsBehavior extends FragmentBase implements SharedPrefe
     private Group grpConversationActions;
 
     private final static String[] RESET_OPTIONS = new String[]{
-            "double_back", "conversation_actions", "conversation_actions_replies", "default_snooze",
+            "double_back", "conversation_actions", "conversation_actions_replies", "language_detection",
+            "default_snooze",
             "pull", "autoscroll", "quick_filter", "quick_scroll",
             "doubletap", "swipenav", "volumenav", "reversed",
             "autoexpand", "expand_all", "expand_one", "collapse_multiple",
@@ -93,6 +95,7 @@ public class FragmentOptionsBehavior extends FragmentBase implements SharedPrefe
         swDoubleBack = view.findViewById(R.id.swDoubleBack);
         swConversationActions = view.findViewById(R.id.swConversationActions);
         swConversationActionsReplies = view.findViewById(R.id.swConversationActionsReplies);
+        swLanguageDetection = view.findViewById(R.id.swLanguageDetection);
         etDefaultSnooze = view.findViewById(R.id.etDefaultSnooze);
         swPull = view.findViewById(R.id.swPull);
         swAutoScroll = view.findViewById(R.id.swAutoScroll);
@@ -144,6 +147,13 @@ public class FragmentOptionsBehavior extends FragmentBase implements SharedPrefe
             }
         });
 
+        swLanguageDetection.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+            @Override
+            public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
+                prefs.edit().putBoolean("language_detection", checked).apply();
+            }
+        });
+
         etDefaultSnooze.addTextChangedListener(new TextWatcher() {
             @Override
             public void beforeTextChanged(CharSequence s, int start, int count, int after) {
@@ -376,6 +386,9 @@ public class FragmentOptionsBehavior extends FragmentBase implements SharedPrefe
         swConversationActions.setChecked(prefs.getBoolean("conversation_actions", true));
         swConversationActionsReplies.setChecked(prefs.getBoolean("conversation_actions_replies", true));
         swConversationActionsReplies.setEnabled(swConversationActions.isChecked());
+        swLanguageDetection.setChecked(prefs.getBoolean("language_detection", true));
+        swLanguageDetection.setVisibility(Build.VERSION.SDK_INT < Build.VERSION_CODES.Q ? View.GONE : View.VISIBLE);
+
         int default_snooze = prefs.getInt("default_snooze", 1);
         etDefaultSnooze.setText(default_snooze == 1 ? null : Integer.toString(default_snooze));
         etDefaultSnooze.setHint("1");

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

@@ -1108,8 +1108,8 @@ public class HtmlHelper {
     static String getLanguage(Context context, String body) {
         try {
             SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
-            boolean conversation_actions = prefs.getBoolean("conversation_actions", true);
-            if (!conversation_actions)
+            boolean language_detection = prefs.getBoolean("language_detection", true);
+            if (!language_detection)
                 return null;
 
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {

app/src/main/res/layout/fragment_options_behavior.xml

@@ -64,6 +64,17 @@
             app:layout_constraintTop_toBottomOf="@id/swConversationActions"
             app:switchPadding="12dp" />
 
+        <androidx.appcompat.widget.SwitchCompat
+            android:id="@+id/swLanguageDetection"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:text="@string/title_advanced_language_detection"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/swConversationActionsReplies"
+            app:switchPadding="12dp" />
+
         <eu.faircode.email.FixedTextView
             android:id="@+id/tvDefaultSnooze"
             android:layout_width="0dp"
@@ -75,7 +86,7 @@
             android:textColor="?android:attr/textColorPrimary"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toStartOf="parent"
-            app:layout_constraintTop_toBottomOf="@id/swConversationActionsReplies" />
+            app:layout_constraintTop_toBottomOf="@id/swLanguageDetection" />
 
         <eu.faircode.email.EditTextPlain
             android:id="@+id/etDefaultSnooze"

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

@@ -431,6 +431,7 @@
     <string name="title_advanced_shortcuts">Show frequently used contacts in Android share menu</string>
     <string name="title_advanced_conversation_actions">Suggest actions</string>
     <string name="title_advanced_conversation_actions_replies">Suggest reply texts</string>
+    <string name="title_advanced_language_detection">Detect message text language</string>
     <string name="title_advanced_fts">Build search index</string>
     <string name="title_advanced_fts_indexed">%1$d / %2$d messages indexed (%3$s)</string>
     <string name="title_advanced_english">Force English language</string>