Real bug found by reading capture_key_down semantics: the web
keyboard handler was registered as `capture_key_down` on the root
div, which fires from root → focused element. So when the user is
on an external tab (https://google.com) and clicks the omnibar to
type a new URL, every keystroke was intercepted at the root, the
text was forwarded to Servo, and `cx.stop_propagation()` killed the
event before it could reach the focused Input. The omnibar appeared
dead.
Gate the handler on `self.focus_handle.is_focused(window)`. The
shell's root handle is only focused when nothing deeper is — clicks
on the web viewport call `focus_handle.focus(window)`, which makes
the root focused; clicks on any Input transfer focus to the Input's
handle and `is_focused` returns false on the root. Now keystrokes
reach the Input untouched while still flowing to Servo when the
user is interacting with the page itself.
cargo test --workspace: 440 passed, 0 failed.
ZacharyZhang-NY
fcac3268ad