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fix(ui): deadlock when exporting transfer function

Erwan DUHAMEL requested to merge 937-fix-ui-transfer-function-exportation-is-broken into dev

Description

This fixes a deadlock in STransferFunction::exportPreset(). Because SWriter::update locks data and so does the function body above, a deadlock occurred.

Closes #937 (closed)

How to test it?

Try to export a transfer function. Should not freeze the application.

Edited by Erwan DUHAMEL

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