Updates the progress bar value, and optionally its text. If the text argument is not specified, any existing text value will be unchanged. To blank out existing text, pass "". Note that even if the progress bar value exceeds 1, it will never automatically reset -- you are responsible for determining when the progress is complete and calling {@link #reset} toclear and/or hide the control.
@param value A value between 0 and 1 (e.g., .5, defaults to 0)
@param text The string to display in the progress text element or null.
@return this
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