Improved PIN handling

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

@@ -2986,12 +2986,14 @@ public class Helper {
                         if (wait > PIN_FAILURE_DELAY_MAX)
                             wait = PIN_FAILURE_DELAY_MAX;
                         long delay = pin_failure_at + wait - new Date().getTime();
+                        etPin.setHint(getDateTimeInstance(activity).format(pin_failure_at + wait));
                         Log.i("PIN wait=" + wait + " delay=" + delay);
                         dview.postDelayed(new Runnable() {
                             @Override
                             public void run() {
                                 try {
                                     etPin.setCompoundDrawables(null, null, null, null);
+                                    etPin.setHint(R.string.title_advanced_pin);
                                     etPin.setEnabled(true);
                                     etPin.requestFocus();
                                     showKeyboard(etPin);

app/src/main/res/layout/dialog_pin_ask.xml

@@ -24,7 +24,7 @@
         android:layout_marginTop="24dp"
         android:drawableStart="@drawable/twotone_hourglass_top_24"
         android:drawablePadding="6dp"
-        android:hint="@string/title_advanced_pin"
+        android:drawableTint="?android:attr/textColorPrimaryNoDisable"
         android:imeOptions="actionDone"
         android:inputType="numberPassword"
         android:maxLines="1"