Refresh Windows process PATH before duplicate check

install.ps1

@@ -333,6 +333,9 @@ function Add-UserPath($PathToAdd) {
         $entries = @($userPath -split ';' | Where-Object { $_ })
     }
     $wanted = Normalize-PathForCompare $PathToAdd
+    if (-not (";$env:Path;").Contains(";$PathToAdd;")) {
+        $env:Path = "$PathToAdd;$env:Path"
+    }
     foreach ($entry in $entries) {
         if ((Normalize-PathForCompare $entry) -ieq $wanted) {
             return
@@ -344,9 +347,6 @@ function Add-UserPath($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

@@ -239,6 +239,12 @@ fn windows_installer_adds_user_path_idempotently() {
     assert!(ps1.contains("(@($entries) + $PathToAdd) -join ';'"));
     assert!(ps1.contains("(\";$env:Path;\").Contains(\";$PathToAdd;\")"));
     assert!(ps1.contains("$env:Path = \"$PathToAdd;$env:Path\""));
+    assert!(
+        ps1.find("(\";$env:Path;\").Contains(\";$PathToAdd;\")")
+            .unwrap()
+            < ps1.find("foreach ($entry in $entries)").unwrap(),
+        "Windows installer must refresh the current shell PATH even when user PATH already contains Dosh"
+    );
     assert!(
         !ps1.contains("\"$userPath;$bindir\""),
         "Windows installer must not write a leading semicolon when user PATH is empty"