Suggestion add mechanism to display monitor coordinates

[GadgetSteve]

General information:

• OS name: Windows
• OS version: 10
• OS architecture: 64 bits
• Resolutions:
  • Monitor 1: 1920x1080
  • Monitor 2: 3840x2160
• Python version: 3.8.6
• MSS version: 6.0.0

Suggestion

Currently you have the option of using the -c flag to specify the capture region coordinates but here is no simple way of knowing which numbers to use. An option on the command line to be able to display the current monitor(s) and the valid coordinates for each would be useful and I think that most of the code must already be present.

Likewise a function to return a list of monitors with the applicable coordinates would be useful programatically.

Other details

I also noticed that any attempt to capture coordinate ranges that are invalid, (e.g. -c100,100,-100,-100) did not result in any output and no error message.

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