Allow a new search to be created with cmd-enter

This replaces the `cmd-alt-shift-F` binding to open a new search. Instead, you can preserve the existing search results by entering a query and then hitting `cmd-enter` instead of `enter`. This opens a new project find view and restores the previous view to whatever query it was previously displaying. It's a bit strange, but I don't want to rely on splitting as the only way of creating multiple sets of search results.

crates/editor/src/editor.rs

@@ -5144,6 +5144,14 @@ impl Editor {
         self.buffer.read(cx).read(cx).text()
     }
 
+    pub fn set_text(&mut self, text: impl Into<String>, cx: &mut ViewContext<Self>) {
+        self.buffer
+            .read(cx)
+            .as_singleton()
+            .expect("you can only call set_text on editors for singleton buffers")
+            .update(cx, |buffer, cx| buffer.set_text(text, cx));
+    }
+
     pub fn display_text(&self, cx: &mut MutableAppContext) -> String {
         self.display_map
             .update(cx, |map, cx| map.snapshot(cx))

crates/language/src/buffer.rs

@@ -1345,6 +1345,13 @@ impl Buffer {
         let _ = language_server.latest_snapshot.blocking_send(snapshot);
     }
 
+    pub fn set_text<T>(&mut self, text: T, cx: &mut ModelContext<Self>) -> Option<clock::Local>
+    where
+        T: Into<String>,
+    {
+        self.edit_internal([0..self.len()], text, false, cx)
+    }
+
     pub fn edit<I, S, T>(
         &mut self,
         ranges_iter: I,