Refresh Windows PATH during install

install.ps1

@@ -344,6 +344,9 @@ function Add-UserPath($PathToAdd) {
         $PathToAdd
     }
     [Environment]::SetEnvironmentVariable("Path", $next, "User")
+    if (-not (";$env:Path;").Contains(";$PathToAdd;")) {
+        $env:Path = "$PathToAdd;$env:Path"
+    }
 }
 
 function Write-Utf8NoBom($Path, $Content) {

tests/release_scripts.rs

@@ -216,6 +216,8 @@ fn windows_installer_adds_user_path_idempotently() {
     assert!(ps1.contains("$wanted = Normalize-PathForCompare $PathToAdd"));
     assert!(ps1.contains("-ieq $wanted"));
     assert!(ps1.contains("(@($entries) + $PathToAdd) -join ';'"));
+    assert!(ps1.contains("(\";$env:Path;\").Contains(\";$PathToAdd;\")"));
+    assert!(ps1.contains("$env:Path = \"$PathToAdd;$env:Path\""));
     assert!(
         !ps1.contains("\"$userPath;$bindir\""),
         "Windows installer must not write a leading semicolon when user PATH is empty"