Allow entering IPv6 address

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

@@ -679,10 +679,9 @@ public class FragmentAccount extends FragmentBase {
                 String realm = args.getString("realm");
                 String fingerprint = args.getString("fingerprint");
 
-                if (host.contains(":")) {
+                int semi = host.indexOf(':');
-                    Uri h = Uri.parse(host);
+                if (semi > 0 && host.indexOf(':', semi + 1) < 0)
-                    host = h.getHost();
+                    host = host.substring(0, semi);
-                }
 
                 if (TextUtils.isEmpty(host))
                     throw new IllegalArgumentException(context.getString(R.string.title_no_host));

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

@@ -744,10 +744,9 @@ public class FragmentIdentity extends FragmentBase {
 
                 boolean should = args.getBoolean("should");
 
-                if (host.contains(":")) {
+                int semi = host.indexOf(':');
-                    Uri h = Uri.parse(host);
+                if (semi > 0 && host.indexOf(':', semi + 1) < 0)
-                    host = h.getHost();
+                    host = host.substring(0, semi);
-                }
 
                 //if (TextUtils.isEmpty(name) && !should)
                 //    throw new IllegalArgumentException(context.getString(R.string.title_no_name));

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

@@ -374,10 +374,9 @@ public class FragmentPop extends FragmentBase {
                 boolean pro = ActivityBilling.isPro(context);
                 boolean should = args.getBoolean("should");
 
-                if (host.contains(":")) {
+                int semi = host.indexOf(':');
-                    Uri h = Uri.parse(host);
+                if (semi > 0 && host.indexOf(':', semi + 1) < 0)
-                    host = h.getHost();
+                    host = host.substring(0, semi);
-                }
 
                 if (TextUtils.isEmpty(host) && !should)
                     throw new IllegalArgumentException(context.getString(R.string.title_no_host));