[core] core_scissor_test not working properly on high DPI screen

[lukekras]

• [ x] I tested it on latest raylib version from master branch
• [ x] I checked there is no similar issue already reported
• [ x] My code has no errors or misuse of raylib

Issue description

I was running the core_scissor_test example program and it wasn't working on a high DPI MacBook Pro. The scissor red box was out of alignment to the mouse outline box.

Environment

macOS Big Sur Intel MacBook Pro

INFO: GL: OpenGL device information:
INFO: > Vendor: Intel Inc.
INFO: > Renderer: Intel(R) Iris(TM) Plus Graphics 650
INFO: > Version: 4.1 INTEL-16.5.2
INFO: > GLSL: 4.10

Issue Screenshot

Code Example

I've submitted a PR #2141

[raysan5]

Related: #1982 and #1987

[lukekras]

Closed PR #2141 and created PR #2160 with refactored code.

[raysan5]

@ArnaudValensi pushed a big commit related, maybe he can look into this issue?

[lukekras]

@raysan5 @ArnaudValensi
I've checked out Fix scissor on macos #2170 and confirm that it fixes this problem. From my point of view this issue can be closed.

PR #2170 makes PR Fix scissor mode for high DPI screens (refactored) #2160 redundant.

[raysan5]

@ArnaudValensi @lukekras thanks to you both for working on this issue and the reviews!

[lukekras]

No problem @raysan5, happy to help where I can. Cheers.