alignment = STRETCH for a property of type RICHTEXT and HTMLTEXT in a horizontal container does not work

[CrushBy]

Sample source code :

tt 'Tt' = DATA LOCAL RICHTEXT ();
FORM test
    PROPERTIES tt()
;
DESIGN test {
    OBJECTS {
        NEW cont {
            caption = 'Note';
            fill = 1;
            horizontal = TRUE;
            MOVE PROPERTY (tt()) {
                caption = '';
                fill = 1;
            }
        }
    }
}
run(){
    DIALOG test DOCKED;
}

As a result PROPERTY(tt()) has the fixed height (instead of stretching) :

element.style {
    height: 6.01709em;
    flex: 1 1 auto;
    min-width: 0rem;
    width: 8.12698em;
}