Don't add collateral sentinel key to input queue

This is for bracketed paste and focus reporting where we already add a proper
event to the queue.

src/input_common.rs

@@ -594,6 +594,9 @@ pub trait InputEventQueuer {
                     }
                     let mut seq = WString::new();
                     let mut key = key_with_escape;
+                    if key == Some(Key::from_raw(key::Invalid)) {
+                        continue;
+                    }
                     let mut consumed = 0;
                     for i in 0..buffer.len() {
                         self.parse_codepoint(