ID 310275 - Glitches and lag while scaling some palettes

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Problem summary
Resizing some palettes will cause temporary drawing artifacts and lag as they are scaled.
This issue is most noticeable with the Color palette, but can also be seen with the Tool Properties and Painting palettes.

Customer reported version
Mari n/a

Customer reported platform
Windows 10

Steps to reproduce

1) Open the Color palette

2) Scale the palette window in any direction

Expected behaviour
The palette should scale smoothly.

Actual behaviour
Palette scaling lags and temporary drawing artifacts can be seen.

Workaround
Unknown.

Reproduced by support
This bug has been reproduced in:
Mari 4.7v2 - Windows 10 - CentOS 7.7
Mari 4.7v1 - Windows 10
Mari 4.6v1 - Windows 10
Mari 4.5v1 - Windows 10
Mari 4.2v1 - Windows 10
Mari 4.1v1 - Windows 10
Mari 4.0v1 - Windows 10 - CentOS 7.7

Earliest version tested
Mari 4.0v1 - This issue appears to be in all versions of the product

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