[DevTools] Allowed to take a screenshot of the currently selected control.

[workgroupengineering]

What does the pull request do?

• Create a screenshot when you press F8 or prsss Button SHot
• Allow Custom Screenshot handelr. The default handler il FileHandler that take a screenshot with this convention:
  • The screenshot is stored using this format [Picture]\Screenshots[App Name][Verision][window][yyyyMMddHHmmss].png
  • [Picture]: is Environment.SpecialFolder.MyPictures.
  • [App Name]: is AssemblyProductAttribute, if missing it uses the name of the currently executing assembly.
  • [Verision]: using AssemblyInformationalVersionAttribute, AssemblyVersionAttribute in order.
  • [window]: the name of the window type of the control I took the screenshot of, es: MainWindow
  • [yyyyMMddHHmmssfff]: datetime.now in iso format.

What is the current behavior?

What is the updated/expected behavior with this PR?

How was the solution implemented (if it's not obvious)?

Checklist

• Added unit tests (if possible)?
• Added XML documentation to any related classes?
• Consider submitting a PR to https://github.com/AvaloniaUI/Avaloniaui.net with user documentation

Breaking changes

Fixed issues

Fixes #4743

[pr8x]

What would be the use case of this?

[workgroupengineering]

I am using while reviewing the UI.

[grokys]

Hm, not sure - this feels like niche functionality that will quickly code-rot due to lack of use. You say:

I am using while reviewing the UI.

Could you give some more details? What are you using it for when reviewing the UI? Reviewing which UI in which way?

More importantly why can't you use OS-provided screenshot functionality?

[workgroupengineering]

In the pre-production sentence, if you identify an incorrect UI behavior with this feature, you will quickly highlight the problem by providing a common approach regardless of the operating system and the installed utility, highlighting a post production to crop the image.

In the future, we may add functionality to report a possible problem found by email or by issuing a ticket in Issue Tracker.