windows: Fix keystroke (#30753)

Closes #22656

Part of #29144, this PR completely rewrites the key handling logic on
Windows, making it much more consistent with how things work on macOS.
However, one remaining issue is that on Windows, we should be using
`Ctrl+Shift+4` instead of `Ctrl+$`. That part is expected to be
addressed in #29144.


Release Notes:

- N/A

crates/gpui/src/platform/keystroke.rs

@@ -56,6 +56,7 @@ impl Keystroke {
     /// This method assumes that `self` was typed and `target' is in the keymap, and checks
     /// both possibilities for self against the target.
     pub(crate) fn should_match(&self, target: &Keystroke) -> bool {
+        #[cfg(not(target_os = "windows"))]
         if let Some(key_char) = self
             .key_char
             .as_ref()
@@ -72,6 +73,18 @@ impl Keystroke {
             }
         }
 
+        #[cfg(target_os = "windows")]
+        if let Some(key_char) = self
+            .key_char
+            .as_ref()
+            .filter(|key_char| key_char != &&self.key)
+        {
+            // On Windows, if key_char is set, then the typed keystroke produced the key_char
+            if &target.key == key_char && target.modifiers == Modifiers::none() {
+                return true;
+            }
+        }
+
         target.modifiers == self.modifiers && target.key == self.key
     }