Update the item if the text has changed but the boundingRect is the

same.
updateBoudingRect update the item only if the boundingRect change
but if we have 123 as an initial text and then we set 321 as the new
text, then nothing happen because the rect is the same.
In case the boundingRect change then we call update 2 times but
the item is already dirty so the second call will just return.

BT:yes
Reviewed-by: Andreas

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