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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Font size
Date: Tue, 20 Aug 2024 15:11:09 +0300
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To: Anand Tamariya <atamariya@gmail.com>
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 (message from Anand Tamariya on Tue, 20 Aug 2024 10:55:45 +0530)
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> From: Anand Tamariya <atamariya@gmail.com>
> Date: Tue, 20 Aug 2024 10:55:45 +0530
> 
> Why does this API keep increasing the font size? With a selection, try the test command.

Because the factor of 10 is wrong, AFAIU.

> Alternatively, what's the best way to query the font-size at point and re-apply using face property?

I don't understand: if you don't want to change the height, then why
do you have :height in the face spec at all?

In any case, :height could be a relative value of 1.0.