Bug 354843

Please add a set of radio buttons or similar that allows the "Internal Pool" memory setting in Krita to be chosen in either of two ways: an explicit percentage of memory, as it already is, or an "automatic" mode that sets the pool size based on the documents that the user opens.

According to the documentation, one can estimate the Internal Pool size based on a formula that gives the amount of bytes in the layer: width * height * bytes-per-pixel.
If there is such a formula, it can be automatically computed by the application when the user sets the Internal Pool to that hypothetic "automatic" mode. The application can then estimate the pool size based on the documents that the user opens, ensuring that it's always an optimal value.

A different logic would have to be implemented so this works without having to startup the program, since the automatic pool size would be defined when a document is opened.

Reproducible: Didn't try

Steps to Reproduce:
1. The Internal Pool memory setting under the Preferences menu.
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