search: auto-focus search field on navigate

I'm going to add a search changelog on this commit since I forgot
to do so previously.

Fixes: https://linear.app/damus/issue/DECK-538/auto-focus-search-field-on-search-view
Changelog-Added: Added fulltext search ui
Signed-off-by: William Casarin <jb55@jb55.com>

crates/notedeck_columns/src/ui/search/state.rs

@@ -6,9 +6,22 @@ use std::time::Duration;
 pub enum SearchState {
     Typing,
     Searched,
+    Navigating,
     New,
 }
 
+#[derive(Debug, Eq, PartialEq)]
+pub enum FocusState {
+    /// Get ready to focus
+    Navigating,
+
+    /// We should request focus when we stop navigating
+    ShouldRequestFocus,
+
+    /// We already focused, we don't need to do that again
+    RequestedFocus,
+}
+
 /// Search query state that exists between frames
 #[derive(Debug)]
 pub struct SearchQueryState {
@@ -20,6 +33,10 @@ pub struct SearchQueryState {
     /// again next frames
     pub state: SearchState,
 
+    /// A bit of context to know if we're navigating to the view. We
+    /// can use this to know when to request focus on the textedit
+    pub focus_state: FocusState,
+
     /// When was the input updated? We use this to debounce searches
     pub debouncer: Debouncer,
 
@@ -39,6 +56,7 @@ impl SearchQueryState {
             string: "".to_string(),
             state: SearchState::New,
             notes: TimelineTab::default(),
+            focus_state: FocusState::Navigating,
             debouncer: Debouncer::new(Duration::from_millis(200)),
         }
     }