### Description
Currently, there are some issues with input handling on Windows:
#### 1. Direct crash when encountering IME input.
https://github.com/zed-industries/zed/assets/14981363/598f7272-1948-4a42-99c5-2ef7b9162a1e
#### 2. Handling messages every 1/60 seconds in the main thread. Despite
being named "immediate_handle," it's not exactly immediate.
```rust
// actually halt here
let wait_result =
unsafe { DCompositionWaitForCompositorClock(Some(&[self.inner.event]), INFINITE) };
// compositor clock ticked so we should draw a frame
if wait_result == 1 {
unsafe { invalidate_thread_windows(GetCurrentThreadId()) };
while unsafe { PeekMessageW(&mut msg, HWND::default(), 0, 0, PM_REMOVE) }.as_bool()
```
#### 3. According to Windows recommendations, character input should be
obtained using `WM_CHAR` instead of `WM_KEYDOWN`. Additionally, there
are problems with the handling within `WM_CHAR`.
```rust
fn handle_char_msg(&self, wparam: WPARAM) -> LRESULT {
let mut callbacks = self.callbacks.borrow_mut();
if let Some(callback) = callbacks.input.as_mut() {
let modifiers = self.current_modifiers();
let msg_char = wparam.0 as u8 as char; // these are u16 chars, cant treat them as u8
```
And, we don't handle `WM_SYSKEYDOWN` properly, which leads to `Alt + F4`
not working.
Release Notes:
- N/A
张小白
36cbfbfb94