Small improvements

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

@@ -87,7 +87,7 @@ public class ActivityCompose extends ActivityBase implements FragmentManager.OnB
             args.putLong("account", -1);
 
             Uri uri = intent.getData();
-            if (uri != null && "mailto".equals(uri.getScheme())) {
+            if (uri != null && "mailto".equalsIgnoreCase(uri.getScheme())) {
                 // https://www.ietf.org/rfc/rfc2368.txt
                 MailTo mailto = MailTo.parse(uri.toString());
 

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

@@ -24,6 +24,7 @@ import android.net.ParseException;
 import android.net.Uri;
 import android.util.Pair;
 
+import androidx.annotation.NonNull;
 import androidx.core.net.MailTo;
 
 import java.io.IOException;
@@ -41,8 +42,8 @@ public class IPInfo {
 
     private final static int FETCH_TIMEOUT = 15 * 1000; // milliseconds
 
-    static Pair<String, Organization> getOrganization(Uri uri, Context context) throws IOException, ParseException {
+    static Pair<String, Organization> getOrganization(@NonNull Uri uri, Context context) throws IOException, ParseException {
-        if ("mailto".equals(uri.getScheme())) {
+        if ("mailto".equalsIgnoreCase(uri.getScheme())) {
             MailTo email = MailTo.parse(uri.toString());
             String to = email.getTo();
             if (to == null || !to.contains("@"))

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

@@ -1282,6 +1282,8 @@ public class MessageHelper {
                     String unsubscribe = entry.substring(lt + 1, gt);
                     Uri uri = Uri.parse(unsubscribe);
                     String scheme = uri.getScheme();
+                    if (scheme != null)
+                        scheme = scheme.toLowerCase(Locale.ROOT);
                     if (mailto == null && "mailto".equals(scheme))
                         mailto = unsubscribe;
                     if (link == null && ("http".equals(scheme) || "https".equals(scheme)))