[texhax] checking if a piece of text stays on one line or more than one line

[Vafa Khalighi]

Hi

Suppose you create a macro similar to \mytextbf, is there a way that you can
check if the text inside \mytextbf will stay on one line or more than one
(if the text inside \textbf statys on just one line do something , but if
stays on more than one line do something else). I guess this is a bit tricky
because:

1) you could have shorter or longer lines

2) you might start using \textbf at the middle or realy end of a specific
line

So is this checking doable?

Thanks
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