[bug] `self.dependencies[lib].cpp_info.resdirs` empty in test package

[SpaceIm]

Environment Details (include every applicable attribute)

• Operating System+version: Windows 10
• Compiler+version: Visual Studio 2022
• Conan version: 1.52.0
• Python version: 3.10.2

Steps to reproduce (Include if Applicable)

In test_package:

    def generate(self):
        self.output.info(f"bindirs: {self.dependencies[<recipename>].cpp_info.bindirs}")
        self.output.info(f"includedirs: {self.dependencies[<recipename>].cpp_info.includedirs}")
        self.output.info(f"libdirs: {self.dependencies[<recipename>].cpp_info.libdirs}")
        self.output.info(f"resdirs: {self.dependencies[<recipename>].cpp_info.resdirs}")

run conan create

Logs (Executed commands with output) (Include/Attach if Applicable)

libjpeg/9e (test package): bindirs: ['C:\\Users\\spaceim\\.conan\\data\\libjpeg\\9e\\_\\_\\package\\e9a552ebe8f994398de9ceee972f0ad207df0658\\bin']
libjpeg/9e (test package): includedirs: ['C:\\Users\\spaceim\\.conan\\data\\libjpeg\\9e\\_\\_\\package\\e9a552ebe8f994398de9ceee972f0ad207df0658\\include']
libjpeg/9e (test package): libdirs: ['C:\\Users\\spaceim\\.conan\\data\\libjpeg\\9e\\_\\_\\package\\e9a552ebe8f994398de9ceee972f0ad207df0658\\lib']
libjpeg/9e (test package): resdirs: []

(In libjpeg recipe, there is a cmake_layout, and resdirs is not modified in package_info(), see https://github.com/conan-io/conan-center-index/pull/13123/commits/30e4ab1c0a00a2f03d98ddc137d7dda7cfb54c56)

[SpaceIm]

Actually it seems that layout() set resdirs to empty

/cc @uilianries @SSE4 @prince-chrismc for documentation in CCI

[memsharded]

Yes, it is true, layout() changes the defaults, as resdirs was not been used very much, we decided that the default should be empty.

Moving this issue to docs.

[uilianries]

Good to know, so we don't need to update it in recipes.