properties not update after updating `conanfile.txt` until reopening the solution in VS2019

[playgithub]

Reproduce:

1. check project properties:
   • C/C++/Command Line
   • Linker/Command Line
2. update conanfile.txt by adding/removing some lib(s), save to trigger installation
3. repeat step 1, the commands for compiling and linking doesn't change
4. reopen the solution, the commands for compiling and linking change according to updates to conanfile.txt