fix: Insert spaces when inlining a function defined in a macro. (partially) fixes #12860. This PR (only) addresses the whitespace issue when inlining functions defined in macros. Additionally, the indentation/spacing is not ideal, but works, e.g. ```rs macro_rules! define_function { () => { fn test_function_macro() { if let Some(3) = 3i32.checked_add(0) { println!("3 + 0 == 3"); } } }; } define_function!(); fn main() { test_function_macro(); } // previously became // ... fn main() { ifletSome(3)=3i32.checked_add(0){println!("3 + 0 == 3");}; } // now becomes // ... fn main() { if let Some(3) = 3i32.checked_add(0){ println!("3 + 0 == 3"); }; } ``` The `self` -> `this` problem[^this] is (probably?) a separate problem that I am also looking into. [^this]: As mentioned in [my comment on the above issue](https://github.com/rust-lang/rust-analyzer/issues/12860#issuecomment-1193231766), inlining a method defined in a macro does not properly replace `self` with the new local `this`.