### Summary Deleting an already saved CI variable `VAR0` in the corresponding settings section and re-creating it causes the error message `Validation failed - Variables key (VAR0) has already been taken` ### Steps to reproduce - Create a new project - Navigate to CI/CD settings for variables - Create a new variable named `VAR0` - Save the variables - Delete the `VAR0` variable - Without saving the variables, recreate the `VAR0` variable ### Example Project ./. ### What is the current *bug* behavior? Error message is displayed ### What is the expected *correct* behavior? The message is wrong in every sense since it is the result of comparison to the last saved state. However the set of variables which is saved is valid, so changes, like the deletion should be reflected/enforced before the validation occurs, the validation message (and probably algorithm) should be changed or re-creation of a not-yet-saved deletion of a variable should be prohibited. ### Relevant logs and/or screenshots ./. ### Output of checks This bug happens on GitLab.com. #### Results of GitLab environment info ./. #### Results of GitLab application Check ./. ### Possible fixes see correct behaviour description