Engine updates after adding node: send import first, then the new node (

#1332)

When the user creates a node through the searcher that needs additional imports, those imports should be added before or simultaneously to the node content to avoid an invalid intermediate state. This was done in the wrong order before this commit.

CHANGELOG.md

@@ -40,6 +40,8 @@
 - [Disable area selection][1318]. The area selection was visible despite being
   non-functional. To avoid confusion, area selection has been disabled until it
   is [correctly implemented][479].
+- [Fix error after adding a node][1332]. Sometimes, after picking a suggestion
+  the inserted node was annotated with "The name could not be found" error.
 - [Handle syntax errors in custom-defined visualizations][1341]. The IDE is now
   able to run properly, even if some of the custom-defined visualisations inside
   a project contain syntax errors.
@@ -69,6 +71,8 @@ you can find their release notes
 [1064]: https://github.com/enso-org/ide/pull/1064
 [1316]: https://github.com/enso-org/ide/pull/1316
 [1318]: https://github.com/enso-org/ide/pull/1318
+[1332]: https://github.com/enso-org/ide/pull/1332
+[1341]: https://github.com/enso-org/ide/pull/1341
 [1328]: https://github.com/enso-org/ide/pull/1328
 [1341]: https://github.com/enso-org/ide/pull/1341
 [1348]: https://github.com/enso-org/ide/pull/1348

src/rust/ide/src/controller/searcher.rs

@@ -657,6 +657,9 @@ impl Searcher {
         };
         let intended_method = self.intended_method();
 
+        // We add the required imports before we create the node/edit its content. This way, we
+        // avoid an intermediate state where imports would already be in use but not yet available.
+        self.add_required_imports()?;
         let id = match *self.mode {
             Mode::NewNode {position} => {
                 let mut new_node           = NewNodeInfo::new_pushed_back(expression);
@@ -676,7 +679,6 @@ impl Searcher {
                 node_id
             }
         };
-        self.add_required_imports()?;
         Ok(id)
     }