true
, a decoration's description text will be shown in an info hover over the field's control whenever the mouse hovers over the decoration. This method can be used to show a decoration's description text at other times (such as when the control receives focus), or to show other text associated with the field. The hover will not be shown if the decoration is hidden.
@param text the text to be shown in the info hover, or null
if no text should be shown.
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