T23d: AI chat, conversations

- ConversationList: pinned first, then by day, newest first; a query keeps
  the titles that hold every word
- ConversationItem: a Tab stop when there is something to do; its menu of
  rename, pin and delete shows on hover, while open, or while the row holds
  focus; a press on the menu leaves the row shut
- new_chat_button, ProjectList, ProjectKnowledgePanel with a capacity meter
- SharedConversationView: who shared it and when, and a way to carry it on
- ConversationExport: format and thinking in a Dialog, Cancel or Export
- icons: square-pen, corner-down-right
- gallery: conversations with rename, pin and delete; projects; a shared
  conversation; export with a toast

src/chat/tests/history.rs

@@ -0,0 +1,98 @@
+use gpui::{
+    Context, IntoElement, KeyUpEvent, Keystroke, Modifiers, ParentElement, Render, SharedString,
+    Styled, TestAppContext, VisualTestContext, Window, div, point, px,
+};
+use jiff::Timestamp;
+
+use super::settle;
+use crate::{
+    chat::{Conversation, ConversationItem},
+    forms,
+    theme::Theme,
+};
+
+/// One conversation's row, and what it asked: opened or renamed.
+struct Row {
+    opened: Vec<SharedString>,
+    renamed: Vec<SharedString>,
+}
+
+impl Render for Row {
+    fn render(&mut self, _: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
+        let (open, rename) = (cx.entity(), cx.entity());
+        let conversation = Conversation {
+            key: "lift".into(),
+            title: "What a lift does".into(),
+            at: Timestamp::UNIX_EPOCH,
+            pinned: false,
+        };
+        div().w(px(300.0)).child(
+            ConversationItem::new("row", conversation)
+                .on_select(move |key, _, cx| open.update(cx, |row, _| row.opened.push(key.clone())))
+                .actions(
+                    move |key, _, cx| rename.update(cx, |row, _| row.renamed.push(key.clone())),
+                    |_, _, _| {},
+                    |_, _, _| {},
+                ),
+        )
+    }
+}
+
+fn row(cx: &mut TestAppContext) -> (gpui::Entity<Row>, &mut VisualTestContext) {
+    cx.update(|cx| {
+        Theme::init(cx);
+        forms::bind_keys(cx);
+    });
+    let (row, cx) = cx.add_window_view(|_, _| Row {
+        opened: Vec::new(),
+        renamed: Vec::new(),
+    });
+    cx.update(|window, _| window.activate_window());
+    settle(cx);
+    (row, cx)
+}
+
+/// Presses and releases `key`, a frame apart.
+fn press(key: &str, cx: &mut VisualTestContext) {
+    cx.simulate_keystrokes(key);
+    settle(cx);
+    cx.simulate_event(KeyUpEvent {
+        keystroke: Keystroke::parse(key).expect("a key"),
+    });
+    settle(cx);
+}
+
+#[gpui::test]
+fn a_rows_actions_open_from_the_keyboard(cx: &mut TestAppContext) {
+    let (row, cx) = row(cx);
+    cx.simulate_mouse_move(point(px(10.0), px(200.0)), None, Modifiers::none());
+    settle(cx);
+    cx.update(|window, _| window.focus_next());
+    settle(cx);
+    cx.update(|window, _| window.focus_next());
+    settle(cx);
+    press("enter", cx);
+    press("enter", cx);
+    row.read_with(cx, |row, _| {
+        assert_eq!(
+            row.renamed,
+            ["lift"],
+            "Tab reaches the menu of the row in focus"
+        );
+        assert!(row.opened.is_empty());
+    });
+}
+
+#[gpui::test]
+fn a_press_on_the_menu_leaves_the_row_shut(cx: &mut TestAppContext) {
+    let (row, cx) = row(cx);
+    let (title, menu) = (point(px(60.0), px(14.0)), point(px(285.0), px(14.0)));
+    cx.simulate_click(title, Modifiers::none());
+    settle(cx);
+    cx.simulate_mouse_move(menu, None, Modifiers::none());
+    settle(cx);
+    cx.simulate_click(menu, Modifiers::none());
+    settle(cx);
+    let opened = row.read_with(cx, |row, _| row.opened.clone());
+    assert_eq!(opened, ["lift"], "only the press on the title opens it");
+}

src/chat/tests/mod.rs

@@ -9,6 +9,7 @@ use gpui::{
 
 mod cite;
 mod compose;
+mod history;
 
 use super::{
     ImageMessage, MessageAvatar, MessageBubble, MessageEditor, MessageList, Role, ThinkingBlock,