Fix element.run_method('focus')

[rodja]

Calling .run_method('focus') on an element stopped working with v1.2.22; worked fine with 1.2.21 as reported in #1092. This PR aims to fix the issue.

• write a test to reproduce the issue
• fix code
• merge into main

[falkoschindler]

I fixed the methods for ui.input.
But the same problem occurs with ui.select. And QSelect has 23 methods, which all need to be forwarded. I'm still hesitant about doing that. Maybe there's a generic way of inheriting all methods from a Quasar component.

[falkoschindler]

Now I found a (probably) better solution:

• Every wrapped Quasar component gets a reference ref="qRef".
• The "run_method" handler in index.html reaches into element.$refs.qRef if a method doesn't exist in the element itself.