list: Export query_input for support update the default Query Input. (#794)
## Break Change
- Updated `set_placeholder` and `set_pattern` method to add `window` and
`cx` argument.
```diff
- fn set_placeholder(&mut self, placeholder: impl Into<SharedString>)
+ fn set_placeholder(&mut self, placeholder: impl Into<SharedString>, _:
&Window, cx: &mut Context<Self>)
- fn set_pattern(&mut self, pattern: regex::Regex)
+ fn set_pattern(&mut self, pattern: regex::Regex, window: &mut Window,
cx: &mut Context<Self>)
```
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