Accessing # of characters shown in a textbox, with cutted content

I have 2 text elements, to mimic the description text of a You Tube clip, where you dont want to show the whole text only if the user clicks: “Show More/Less”. so one text box has the “Cut off content” option checked, and the other is unchecked, and they are shown/hidden based on toggeling the “Show More/Less” text.

But i want to hide the “Show More/Less” text if the content fits in the first place, how would i write such a condition?

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