The branch 4.2/disable-submit-buttons-on-submit was deleted and repushed:
was 036f1090ba5900ae1c91c9b9d2e50c6750391aeb
now f8637121db66b6115fafe317ca73b25c0abbc3fb
1: 036f109 < -: ------- prevent double form submit by disabling buttons
-: ------- > 1: f863712 prevent double form submit by disabling buttons