Emit correct events when deselecting all nodes. (#1664)

CHANGELOG.md

@@ -18,6 +18,9 @@
   undo last action and <kbd>cmd</kbd>+<kbd>z</kbd> to redo last undone action.
   This version of undo redo does not have proper support for text editor and
   undoing UI changes (like selecting nodes).
+- [Fox node selection bug ][1664]. Fix nodes not being deselected correctly in
+  some circumstances. This would lead to nodes moving too fast when dragged
+  [1650] or the internal state of the project being inconsistent [1626].
 
 #### EnsoGL (rendering engine)
 
@@ -34,6 +37,9 @@
 [1577]: https://github.com/enso-org/ide/pull/1577
 [1587]: https://github.com/enso-org/ide/pull/1587
 [1602]: https://github.com/enso-org/ide/pull/1602
+[1602]: https://github.com/enso-org/ide/pull/1664
+[1602]: https://github.com/enso-org/ide/pull/1650
+[1602]: https://github.com/enso-org/ide/pull/1626
 
 # Enso 2.0.0-alpha.5 (2021-05-14)
 

src/rust/ide/src/ide.rs

@@ -65,7 +65,7 @@ impl Ide {
         let mouse    = &scene.mouse.frp;
         let keyboard = &scene.keyboard.frp;
 
-        enso_frp::extend! { TRACE_ALL network
+        enso_frp::extend! { network
             on_log_sent          <- source::<()>();
             mouse_moved          <- mouse.position.constant(());
             any_mouse_press      <- any(mouse.up,mouse.down).constant(());

src/rust/ide/view/graph-editor/src/lib.rs

@@ -960,6 +960,11 @@ impl Nodes {
     fn select(&self, node_id:impl Into<NodeId>) {
         let node_id = node_id.into();
         if let Some(node) = self.get_cloned_ref(&node_id) {
+            // Remove previous instances and add new selection at end of the list, indicating that
+            // this node was selected last, superseding the previous selection.
+            while self.selected.contains(&node_id) {
+                  self.selected.remove_item(&node_id)
+            }
             self.selected.push(node_id);
             node.frp.select.emit(());
         }

src/rust/ide/view/graph-editor/src/selection.rs

@@ -310,6 +310,7 @@ impl Controller {
 
 
         frp::extend! { network
+            deselect_all_nodes      <- any_(...);
 
             enable_area_selection  <- source();
 
@@ -373,7 +374,7 @@ impl Controller {
 
             keep_selection     <- selection_mode.map(|t| *t != Mode::Normal);
             deselect_on_select <- drag_start.gate_not(&keep_selection);
-            eval_ deselect_on_select ( nodes.deselect_all() );
+            deselect_all_nodes <+ deselect_on_select;
 
             cursor_selection_nodes.insert <+ node_info;
             cursor_selection_nodes.remove_difference_with_vec <+ nodes_in_bb;
@@ -417,7 +418,6 @@ impl Controller {
                 |_,mode,was_selected| mode.single_should_deselect(*was_selected)
             );
 
-            deselect_all_nodes      <- any_(...);
             deselect_on_select      <- node_to_select.gate_not(&keep_selection);
             deselect_all_nodes      <+ deselect_on_select;
             deselect_all_nodes      <+ editor.deselect_all_nodes;