add new visual options

[Kureii]

Add new feature
add option of margin and round coner of background.

[nutti]

@Kureii

Thanks for the PR! It looks nice feature to me.
I tried your patch in my environment.
But the render result seems not fine.
Background color and the rectangle size is invalid.

OS: Windows 10
Blender: Both 2.83 and 2.91

Could you check your patch in your environment?

[nutti]

@Kureii

Is there any update?
If you stuck, I can help you.

[Kureii]

@nutti
Sorry only I don't have time, too much things to school

[nutti]

@Kureii

No, problem.
If you need a help, feel free to tell me.

[nutti]

@Kureii

Is there any update about this PR?
If you are not enough time to tackle this, I will try to do additional work.

[Kureii]

@nutti
today I finishing my last projecto to the school and now I'll have a time for this

[Kureii]

I don't know, where I do mistake, I replace draw_box to draw_roundet_box, but it isint work in draw area mode...

[nutti]

@Kureii

Please double-check your patch while Background option is on.
Your patch breaks the background and cursor color.

I will show you the expected behavior

[nutti]

@Kureii

BTW, does this patch work on your environment?
I think that some changes break the layout.

If you provide me the specification of margin and background_round option, I will fix them.

[nutti]

I fixed your patch on my environment.

There are still UI break changes, so we need to fix other places too.

[nutti]

@Kureii

Is it possible to enable Allow edits by maintainers of this PR?
If this option is enabled, I can commit my patch to your branch.

My patch also can be seen from kureii-patch branch.

[Kureii]

I had same problem and I didn't know how to repair it

[nutti]

@Kureii

I have already fixed your issue. So I want to merge my codes to your repository.
Could you enable Allow edits from maintainers checkbox from right side of this PR?

Please also see this documents.
https://docs.github.com/en/github/collaborating-with-pull-requests/working-with-forks/allowing-changes-to-a-pull-request-branch-created-from-a-fork

[Kureii]

It's enable

[nutti]

@Kureii

Sorry for my failed operation.

I tried to fix the issue.
At first, could you merge this PR?
Kureii#1

[nutti]

@Kureii

Thanks for merging my PR. Now I can reopen this PR.
I think the current version in master branch on your repository works fine (above bugs are fixed).
Could you check this one on your environment?

[Kureii]

It's work good, I don't have any problem

[nutti]

@Kureii

Thanks.
I will merge this PR after some small fix.

[nutti]

LGTM.

Thanks for trying to do this work! @Kureii

[Kureii]

I need more practise, this was my first try with coding blender add-on.

[nutti]

@Kureii

Thanks for nice suggestions and great works to this project.
If you consider to contribute to this project more, feel free to open new PR.
This project is contribution welcomed.

[Kureii]

thank you for your willingness and patience.