function _selectTextIfFocused(oInput, iStart, iEnd) {
		if (document.activeElement === oInput.getFocusDomRef()) {
			oInput.selectText(iStart, iEnd);
		}
	}
Selects part of the text in the input if the input is focused.

@param oInput {sap.m.Input}
@param iStart {int} From which character to start.
@param iEnd {int} Which character to end with.