Estimating width of SeparatorText

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Details:

I am using a SeparatorText on a small screen (mobile device) and the text gets truncated. This is fine. However, I would like to supply the shorter text myself instead of just relying on "..."

This is the actual problem I'd like to solve, but it doesn't look like there is a way to supply custom truncation text.

As a second approach, I would like to know whether the SeparatorText was going to be truncated, and supply shorter text for the label myself.

What is a good way to estimate the width of the SeparatorText, horizontal bars and everything? I would like to compare that with available width, and supply different text accordingly.

Screenshots/Video:

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Minimal, Complete and Verifiable Example code: