Add aspect ratio lock to Pixelize filter dialog
This adds an aspect ratio lock to the Pixelize filter's width and height,
and turns it on by default. However, the state of the lock isn't saved if unchecked.
The code seems a bit hacky, needing to search for the widgets and layout with findChild().
It would probably be better to refactor the widget...
Requested on KA here: https://krita-artists.org/t/append-chain-link-button-for-square-size-to-pixelize-filter/80939
Test Plan
Open the Pixelize Filter, check that the new aspect lock button works.
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.
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