Resolution of panorama preview

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Please provide an answer.

There is currently no way to do this.
There is several issues to solve to implement this:
First is speed: if you use bigger images you need more power to remap all images. The fast preview was written to get nearly real time feedback. This is only achieved by using smaller images and some approximation.
Second is the memory of the GPU: *all* images have to fit into the memory of the graphic card. So Hugin is currently using smaller images.

That reply assumes there is no space for improvement and that everyone has a weak GPU.
1- Modern GPUs can handle far larger images than the resolution the preview currently uses.
2- Even some non-modern GPUs can handle considerably larger images.

So the solution is to make this an option in Preferences, so that the user can decide.

It seems you know the code better. Then provide a patch.

*All* input images need to be inside the GPU images. So a project with only 10 12MP images would require already nearly 500 MB if all images would be used in full resolution. And then you would not have any real time feedback.
And many users work with ever bigger projects.
The screen resolution of the preview window is therefore only the smallest contribution.
But it seems you know it better.

Everything you wrote is true, and yet my points are still valid.
Nobody is forcing everyone to use a higher resolution, this is a request for higher resolution to be an option for those who need it.