Don't show console on Windows

When used inside GUI application, gix causes console window to appear temporarily, due to execution of git.

Command needs special flags to prevent that. More details: https://stackoverflow.com/a/60958956

Author: sheremetyev

gix-path/src/env/git/mod.rs

@@ -82,6 +82,12 @@ pub(super) static EXE_NAME: &str = "git";
 pub(super) static EXE_INFO: Lazy<Option<BString>> = Lazy::new(|| {
     let git_cmd = |executable: PathBuf| {
         let mut cmd = Command::new(executable);
+        #[cfg(windows)]
+        {
+            use std::os::windows::process::CommandExt;
+            const CREATE_NO_WINDOW: u32 = 0x08000000;
+            cmd.creation_flags(CREATE_NO_WINDOW);
+        }
         cmd.args(["config", "-l", "--show-origin"])
             .stdin(Stdio::null())
             .stderr(Stdio::null());

gix-path/src/env/mod.rs

@@ -109,6 +109,12 @@ pub fn system_prefix() -> Option<&'static Path> {
             }
 
             let mut cmd = std::process::Command::new(exe_invocation());
+            #[cfg(windows)]
+            {
+                use std::os::windows::process::CommandExt;
+                const CREATE_NO_WINDOW: u32 = 0x08000000;
+                cmd.creation_flags(CREATE_NO_WINDOW);
+            }
             cmd.arg("--exec-path").stderr(std::process::Stdio::null());
             gix_trace::debug!(cmd = ?cmd, "invoking git to get system prefix/exec path");
             let path = cmd.output().ok()?.stdout;