440962 Fix loading of buggy ASL files
This MR blocks retrieving the gradient from the UI when there's none available, and reassigns UUIDs when multiple layer styles share one.
Test Plan
Check that the ASL files in https://bugs.kde.org/show_bug.cgi?id=440962 can be loaded and used without complaint.
Formalities Checklist
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I confirmed this builds. -
I confirmed Krita ran and the relevant functions work. -
I tested the relevant unit tests and can confirm they are not broken. (If not possible, don't hesitate to ask for help!) -
I made sure my commits build individually and have good descriptions as per KDE guidelines. -
I made sure my code conforms to the standards set in the HACKING file. -
I can confirm the code is licensed and attributed appropriately, and that unattributed code is mine, as per KDE Licensing Policy.