[clangd] Doesn't re-parse edited non-current file until saved

Steps to reproduce:

1. Enable Clangd
2. Have a class header and it's cpp file
3. Open header, add void foo() method
4. Press Alt-Enter and select "Add definition in name.cpp"
5. It switches to cpp file with a function definition

Expected result:

• doesn't show an error

Actual result:

• Shows an error in annotation for this function: "name.cpp:13:18: Out-of-line definition of 'foo' does not match any declaration in 'name'"

Additional info: After pressing Ctrl-Shift-S to save all opened files the error disappears