devenv should import env vars from vsenv

mesonbuild/mdevenv.py

@@ -157,6 +157,7 @@ def run(options: argparse.Namespace) -> int:
     b = build.load(options.builddir)
     workdir = options.workdir or options.builddir
 
+    setup_vsenv(b.need_vsenv)  # Call it before get_env to get vsenv vars as well
     dump_fmt = options.dump_format if options.dump else None
     devenv, varnames = get_env(b, dump_fmt)
     if options.dump:
@@ -180,8 +181,6 @@ def run(options: argparse.Namespace) -> int:
     install_data = minstall.load_install_data(str(privatedir / 'install.dat'))
     write_gdb_script(privatedir, install_data, workdir)
 
-    setup_vsenv(b.need_vsenv)
-
     args = options.devcmd
     if not args:
         prompt_prefix = f'[{b.project_name}]'