editing env vars in launch configs causes UI issues

Various UI issues coming up when editing env vars in launch configs.

Steps to reproduce:
- open launch config, select "Environment" tab
- add an env var entry (but do not press "Apply" yet, so the launch config is "dirty")
- select another launch config
- dialog comes up (don't save, cancel, save)

path 1:
- press "cancel" => the other selected launch config rendering is broken (icon is still there, label is blank)

path 2:
- press "save" => the newly selected launch config is selected, but the UI on the right is blank
- then selecting another launch config causes the dialog to popup again and both launch configs to be selected

then try to close launch config window via the window close icon causes many launch configs to be selected, the dirty dialog to popup, maybe associated with many launch configs, cause pressing "cancel" once doesn't cause the dialog to disappear.

All running 2026-03 on macOS 26.3.1, Apple Silicon.