Don't redeploy the whole environment when modifying an application-level envvar

When you modify an application variable, there is a popup that offers you to redeploy, so that your environment settings are applied. Clicking the redeploy button actually redeploys the whole environment rather than just the current application, even when only application-level environment variables have been modified. This is frustrating because most of the time I only intend to redeploy the current application, but then realize a few minutes later that all my applications are being redeployed unnecessarily. I propose to change the behavior so that it will redeploy only the current application when it's possible, and ask confirmation for redeploying all applications in the environment when necessary (e.g. "You're about to redeploy all applications in the current environment" → Proceed / Cancel / Only deploy the current application)