Give visible error when setting component name to an already used name

[Kezii]

When you change a component name to an already used name, if you press enter, the "Edit Component Properties" window closes without giving any notice and without changing the name of the component.
If you press apply, the name reverts to the last one, without giving any notice or context.

Instead, a notification / popup box should be sent after a wrong submission, or, an interactive check should be implemented, for example changing the color of the text box to red if the name is invalid, explaining what the problem is.

[felix-salfelder]

I like the color idea. We'd need a patch still.

Notice or context. We have a status bar for a notice, we could set the cursor back to the name for context...