[WebProfilerBundle] Show error message in toolbar instead of JS confirmation #23264
Description
| Q | A |
|---|---|
| Bug report? | no |
| Feature request? | yes |
| BC Break report? | no |
| RFC? | yes |
| Symfony version | 3.4 |
As suggested by @javiereguiluz in #23251 (comment), show a fake toolbar with an error message instead of the JS confirmation dialog when loading the toolbar fails.