OAuth/PCKE is used by default

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

@@ -281,7 +281,6 @@ public class EmailProvider implements Parcelable {
                         provider.oauth.askAccount = getAttributeBooleanValue(xml, "askAccount", false);
                         provider.oauth.clientId = xml.getAttributeValue(null, "clientId");
                         provider.oauth.clientSecret = xml.getAttributeValue(null, "clientSecret");
-                        provider.oauth.pcke = getAttributeBooleanValue(xml, "pcke", false);
                         provider.oauth.scopes = xml.getAttributeValue(null, "scopes").split(",");
                         provider.oauth.authorizationEndpoint = xml.getAttributeValue(null, "authorizationEndpoint");
                         provider.oauth.tokenEndpoint = xml.getAttributeValue(null, "tokenEndpoint");
@@ -1306,7 +1305,6 @@ public class EmailProvider implements Parcelable {
         boolean askAccount;
         String clientId;
         String clientSecret;
-        boolean pcke;
         String[] scopes;
         String authorizationEndpoint;
         String tokenEndpoint;

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

@@ -460,9 +460,6 @@ public class FragmentOAuth extends FragmentBase {
                     authRequestBuilder.setLoginHint(address);
             }
 
-            if (provider.oauth.pcke)
-                authRequestBuilder.setCodeVerifier(CodeVerifierUtil.generateRandomCodeVerifier());
-
             if (!TextUtils.isEmpty(provider.oauth.prompt))
                 authRequestBuilder.setPrompt(provider.oauth.prompt);
 

app/src/main/res/xml/providers.xml

@@ -232,7 +232,6 @@
             clientId="dj0yJmk9SWtNZm1vUFc2THJDJnM9Y29uc3VtZXJzZWNyZXQmc3Y9MCZ4PWRi"
             clientSecret="261a91fbbdb2852c4e80fdd3d1db4a8ebfa4c42b"
             enabled="true"
-            pcke="true"
             privacy="https://www.verizonmedia.com/policies/us/en/verizonmedia/privacy/index.html"
             redirectUri="https://oauth.faircode.eu/"
             scopes="mail-w"
@@ -872,7 +871,6 @@
             authorizationEndpoint="https://api.login.aol.com/oauth2/request_auth"
             clientId="dj0yJmk9SFVJYWVtS21RMjYyJmQ9WVdrOVJVcENRMXBTT1drbWNHbzlNQT09JnM9Y29uc3VtZXJzZWNyZXQmc3Y9MCZ4PTJh"
             enabled="true"
-            pcke="true"
             privacy="https://legal.yahoo.com/us/en/yahoo/privacy/index.html"
             redirectUri="https://oauth.faircode.eu/"
             scopes="mail-w"