private void updateField(boolean fireEvent) {
		String text = getText();
		hasText = text.length() > 0;

		updateFocusFlashing();

		updateColor();

		if (fireEvent) {
			fireFilterChanged(text);
		}

		boolean showFilterButton = hasText && textField.isEnabled();
		updateFilterButton(showFilterButton);
	}
Returns the accessible name prefix set by a previous call to 
{@link #setAccessibleNamePrefix(String)}.  This will be null if not set.
@return the prefix
Ghidra/Framework/Docking/src/main/java/docking/widgets/filter/FilterTextField.java