Use FAQ to explain removal of algorithmic darkening

FAQ.md

@@ -284,7 +284,7 @@ Fonts, sizes, colors, etc should be material design whenever possible.
 * [(78) How do I use schedules?](#user-content-faq78)
 * [(79) How do I use synchronize on demand (manual)?](#user-content-faq79)
 * [~~(80) How do I fix the error 'Unable to load BODYSTRUCTURE'?~~](#user-content-faq80)
-* [~~(81) Can you make the background of the original message dark in the dark theme?~~](#user-content-faq81)
+* [(81) Can you make the background of the original message view dark in dark themes?](#user-content-faq81)
 * [(82) What is a tracking image?](#user-content-faq82)
 * [(84) What are local contacts for?](#user-content-faq84)
 * [(85) Why is an identity not available?](#user-content-faq85)
@@ -2873,12 +2873,15 @@ You'll likely want to disabled [browse on server](#user-content-faq24) too.
 <br />
 
 <a name="faq81"></a>
-**~~(81) Can you make the background of the original message dark in the dark theme?~~**
+**(81) Can you make the background of the original message view dark in dark themes?**
 
 &#x1F30E; [Google Translate](https://translate.google.com/translate?sl=en&u=https://github.com/M66B/FairEmail/blob/master/FAQ.md%23user-content-faq81)
 
-~~The original message is shown as the sender has sent it, including all colors.~~
-~~Changing the background color would not only make the original view not original anymore, it can also result in unreadable messages.~~
+The original message view will use a dark background when using a dark theme for Android version 10 and later.
+
+For Android before version 10 Google removed this feature from the [Android System WebView](https://play.google.com/store/apps/details?id=com.google.android.webview),
+even though it worked fine in most cases.
+Please see [this issue](https://issuetracker.google.com/issues/237785596) (requires a Google account login) requesting to restore this feature again for more information.
 
 <br />
 

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

@@ -2145,7 +2145,7 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                     boolean button_hide = prefs.getBoolean("button_hide", false);
                     boolean button_importance = prefs.getBoolean("button_importance", false);
                     boolean button_translate = prefs.getBoolean("button_translate", true);
-                    boolean button_force_light = prefs.getBoolean("button_force_light", false);
+                    boolean button_force_light = prefs.getBoolean("button_force_light", true);
                     boolean button_search = prefs.getBoolean("button_search", false);
                     boolean button_search_text = prefs.getBoolean("button_search_text", false);
                     boolean button_event = prefs.getBoolean("button_event", false);
@@ -6282,8 +6282,7 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                     btnIssue.setOnClickListener(new View.OnClickListener() {
                         @Override
                         public void onClick(View v) {
-                            Uri uri = Uri.parse("https://issuetracker.google.com/issues/237785596");
-                            Helper.view(v.getContext(), uri, true);
+                            Helper.viewFAQ(v.getContext(), 81);
                         }
                     });
 
@@ -8471,7 +8470,7 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
             cbSearch.setChecked(prefs.getBoolean("button_search", false));
             cbSearchText.setChecked(prefs.getBoolean("button_search_text", false));
             cbTranslate.setChecked(prefs.getBoolean("button_translate", true));
-            cbForceLight.setChecked(prefs.getBoolean("button_force_light", false));
+            cbForceLight.setChecked(prefs.getBoolean("button_force_light", true));
             cbEvent.setChecked(prefs.getBoolean("button_event", false));
             cbShare.setChecked(prefs.getBoolean("button_share", false));
             cbPin.setChecked(prefs.getBoolean("button_pin", false));

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

@@ -635,7 +635,7 @@ public class ApplicationEx extends Application
             if (!prefs.contains("auto_identity"))
                 editor.putBoolean("auto_identity", true);
         } else if (version < 1931)
-            editor.remove("fake_dark");
+            editor.remove("button_force_light").remove("fake_dark");
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O && !BuildConfig.DEBUG)
             editor.remove("background_service");