agent2: Port user_modifier_to_send setting (#36550)

Release Notes:

- N/A

assets/keymaps/default-linux.json

@@ -327,7 +327,7 @@
     }
   },
   {
-    "context": "AcpThread > Editor",
+    "context": "AcpThread > Editor && !use_modifier_to_send",
     "use_key_equivalents": true,
     "bindings": {
       "enter": "agent::Chat",
@@ -336,6 +336,16 @@
       "ctrl-shift-n": "agent::RejectAll"
     }
   },
+  {
+    "context": "AcpThread > Editor && use_modifier_to_send",
+    "use_key_equivalents": true,
+    "bindings": {
+      "ctrl-enter": "agent::Chat",
+      "shift-ctrl-r": "agent::OpenAgentDiff",
+      "ctrl-shift-y": "agent::KeepAll",
+      "ctrl-shift-n": "agent::RejectAll"
+    }
+  },
   {
     "context": "ThreadHistory",
     "bindings": {

assets/keymaps/default-macos.json

@@ -379,7 +379,7 @@
     }
   },
   {
-    "context": "AcpThread > Editor",
+    "context": "AcpThread > Editor && !use_modifier_to_send",
     "use_key_equivalents": true,
     "bindings": {
       "enter": "agent::Chat",
@@ -388,6 +388,16 @@
       "cmd-shift-n": "agent::RejectAll"
     }
   },
+  {
+    "context": "AcpThread > Editor && use_modifier_to_send",
+    "use_key_equivalents": true,
+    "bindings": {
+      "cmd-enter": "agent::Chat",
+      "shift-ctrl-r": "agent::OpenAgentDiff",
+      "cmd-shift-y": "agent::KeepAll",
+      "cmd-shift-n": "agent::RejectAll"
+    }
+  },
   {
     "context": "ThreadHistory",
     "bindings": {

crates/agent_ui/src/acp/message_editor.rs

@@ -9,7 +9,7 @@ use anyhow::{Context as _, Result, anyhow};
 use assistant_slash_commands::codeblock_fence_for_path;
 use collections::{HashMap, HashSet};
 use editor::{
-    Anchor, AnchorRangeExt, ContextMenuOptions, ContextMenuPlacement, Editor, EditorElement,
+    Addon, Anchor, AnchorRangeExt, ContextMenuOptions, ContextMenuPlacement, Editor, EditorElement,
     EditorEvent, EditorMode, EditorStyle, ExcerptId, FoldPlaceholder, MultiBuffer,
     SemanticsProvider, ToOffset,
     actions::Paste,
@@ -21,8 +21,8 @@ use futures::{
 };
 use gpui::{
     AppContext, ClipboardEntry, Context, Entity, EventEmitter, FocusHandle, Focusable,
-    HighlightStyle, Image, ImageFormat, Img, Subscription, Task, TextStyle, UnderlineStyle,
-    WeakEntity,
+    HighlightStyle, Image, ImageFormat, Img, KeyContext, Subscription, Task, TextStyle,
+    UnderlineStyle, WeakEntity,
 };
 use language::{Buffer, Language};
 use language_model::LanguageModelImage;
@@ -122,6 +122,7 @@ impl MessageEditor {
             if prevent_slash_commands {
                 editor.set_semantics_provider(Some(semantics_provider.clone()));
             }
+            editor.register_addon(MessageEditorAddon::new());
             editor
         });
 
@@ -1648,6 +1649,31 @@ fn parse_slash_command(text: &str) -> Option<(usize, usize)> {
     None
 }
 
+pub struct MessageEditorAddon {}
+
+impl MessageEditorAddon {
+    pub fn new() -> Self {
+        Self {}
+    }
+}
+
+impl Addon for MessageEditorAddon {
+    fn to_any(&self) -> &dyn std::any::Any {
+        self
+    }
+
+    fn to_any_mut(&mut self) -> Option<&mut dyn std::any::Any> {
+        Some(self)
+    }
+
+    fn extend_key_context(&self, key_context: &mut KeyContext, cx: &App) {
+        let settings = agent_settings::AgentSettings::get_global(cx);
+        if settings.use_modifier_to_send {
+            key_context.add("use_modifier_to_send");
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use std::{ops::Range, path::Path, sync::Arc};