Deselect visualization when its node gets removed (#1556)

CHANGELOG.md

@@ -11,6 +11,10 @@
 #### Visual Environment
 
 - [Delete key will delete selected nodes][1538].
+- [It is possible to move around after deleting a node with a selected
+  visualization][1556]. Deleting a node while its attached visualization was
+  selected made it impossible to pan or zoom around the stage afterwards. This
+  error is fixed now.
 - [Fixed an internal error that would make the IDE fail on some browser.][1561].
   Instead of crashing on browser that don't support the feature we use, we are
   now just start a little bit slower.

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

@@ -2987,6 +2987,7 @@ fn new_graph_editor(app:&Application) -> GraphEditor {
     eval out.node_selected   ((id) model.select_node(id));
     eval out.node_deselected ((id) model.deselect_node(id));
     eval out.node_removed    ((id) model.remove_node(id));
+    out.source.on_visualization_select <+ out.node_removed.map(|&id| Switch::Off(id));
 
     eval inputs.set_node_expression (((id,expr)) model.set_node_expression(id,expr));
     port_to_refresh <= inputs.set_node_expression.map(f!(((id,_))model.node_in_edges(id)));