fix #7973: Collect env vars lowercase on windows

- Populate local copy of environment variables with lowercase keys if on
Windows platform
- Fix #7973: Environment variables are not retrieved properly on Windows
- Update changelog

Signed-off-by: David Schafhauser <schafhauser.david@gmail.com>

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Change Log
 
+## v1.4.0
+
+- [core] fixed handling of environment variables on Windows [#7973](https://github.com/eclipse-theia/theia/pull/7973)
+
 ## v1.3.0
 
 - [cli] updated the download script to warn about mandatory `theiaPlugins` field [#8058](https://github.com/eclipse-theia/theia/pull/8058)
@@ -49,7 +53,6 @@ Breaking Changes:
 - [shell] updated `ApplicationShell.TrackableWidgetProvider.getTrackableWidgets` to be synchronous in order to register child widgets in the same tick [#7957](https://github.com/eclipse-theia/theia/pull/7957)
   - use `ApplicationShell.TrackableWidgetProvider.onDidChangeTrackableWidgets` if child widgets are added asynchronously
 
-
 ## v1.2.0
 
 - [application-manager] added ability for clients to add `windowOptions` using an IPC-Event [#7803](https://github.com/eclipse-theia/theia/pull/7803)

packages/core/src/node/env-variables/env-variables-server.ts

@@ -30,7 +30,11 @@ export class EnvVariablesServerImpl implements EnvVariablesServer {
     constructor() {
         const prEnv = process.env;
         Object.keys(prEnv).forEach((key: string) => {
-            this.envs[key] = { 'name': key, 'value': prEnv[key] };
+            let keyName = key;
+            if (isWindows) {
+                keyName = key.toLowerCase();
+            }
+            this.envs[keyName] = { 'name': keyName, 'value': prEnv[key] };
         });
     }