better handling of sketch de-select and delete

src/main/mesh.js

@@ -280,9 +280,10 @@ function space_init(data) {
                     }
                     break;
                 case 'Escape':
-                    selection.clear();
+                    if (selection.clear()) {
-                    mesh.edges.clear();
+                        mesh.edges.clear();
-                    mesh.split.end();
+                        mesh.split.end();
+                    }
                     estop(evt);
                     break;
                 case 'Backspace':

src/mesh/api.js

@@ -131,7 +131,7 @@ const selection = {
     // remove all
     delete() {
         let list = selection.list(true);
-        if (list[0].type === 'sketch' && list[0].delete_selected()) {
+        if (list[0]?.type === 'sketch' && list[0].selection_delete()) {
             return;
         }
         for (let s of list) {
@@ -160,6 +160,10 @@ const selection = {
     },
 
     clear() {
+        let list = selection.list(true);
+        if (list[0]?.type === 'sketch' && list[0].selection_clear()) {
+            return false;
+        }
         for (let s of selection.list()) {
             selection.remove(s);
             tools.remove(s);
@@ -167,6 +171,7 @@ const selection = {
         for (let m of api.model.list()) {
             m.clearSelections();
         }
+        return true;
     },
 
     visible() {

src/mesh/sketch.js

@@ -135,16 +135,24 @@ mesh.sketch = class MeshSketch extends mesh.object {
         return this.items.filter(i => i.selected);
     }
 
-    // return true if any selections were deleted;
+    // return true if any selections were cleared
-    delete_selected() {
+    selection_clear() {
+        let sel = this.items.filter(i => i.selected);
+        if (sel.length) {
+            sel.forEach(s => s.selected = false);
+            this.render();
+        }
+        return sel.length;
+    }
+
+    // return true if any selections were deleted
+    selection_delete() {
         let sel = this.items.filter(i => i.selected);
         if (sel.length) {
             this.items = this.items.filter(i => !i.selected);
             this.render();
-            return true;
-        } else {
-            return false;
         }
+        return sel.length;
     }
 
     rename(newname) {