in src/main/java/ru/adelf/idea/dotenv/inspections/LowercaseKeyInspection.java [60:71]
public void applyFix(@NotNull Project project, @NotNull ProblemDescriptor descriptor) {
try {
PsiElement psiElement = descriptor.getPsiElement();
PsiElement newPsiElement = DotEnvFactory.createFromText(project, DotEnvTypes.KEY,
psiElement.getText().toUpperCase(Locale.ROOT) + "=dummy");
psiElement.replace(newPsiElement);
} catch (IncorrectOperationException e) {
Logger.getInstance(IncorrectDelimiterInspection.class).error(e);
}
}