Fix infinite recomposition in Text.foregroundStyle(LinearGradient())

[dfabulich]

Fixes #437

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  Repro infinite recomposition with .foregroundStyle(LinearGradient()) skipapp-showcase#107

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Cursor tracked this down and fixed it. I manually tested it with skiptools/skipapp-showcase#107 in Showcase Lite mode.

[dfabulich]

I think this was caused by #424 … not sure if I'm undoing your fix in this PR.

But… what did it fix, exactly? Was there a bug you were fixing there that I could repro, and test that I didn't just re-break it?

[marcprux]

I think you are right. I've updated the rationale for that earlier (admittedly minimally tested) fix at: #424 (comment)

I had intended to have the brush itself be remember'd — I'm not sure how I missed that. I've confirmed that your fix also fixes the original bug I was seeing.

[dfabulich]

I added remember, but I didn't test against Sirtet.