implement shift-click to select notes in between clicked and active note, closes #2647

src/public/app/widgets/note_tree.js

@@ -309,13 +309,39 @@ export default class NoteTreeWidget extends NoteContextAwareWidget {
 
                 if (targetType === 'title' || targetType === 'icon') {
                     if (event.shiftKey) {
-                        node.setSelected(!node.isSelected());
+                        const activeNode = this.getActiveNode();
+
+                        if (activeNode.getParent() !== node.getParent()) {
+                            return;
+                        }
+
+                        this.clearSelectedNodes();
+
+                        function selectInBetween(first, second) {
+                            for (let i = 0; first && first !== second && i < 10000; i++) {
+                                first.setSelected(true);
+                                first = first.getNextSibling();
+                            }
+
+                            second.setSelected();
+                        }
+
+                        if (activeNode.getIndex() < node.getIndex()) {
+                            selectInBetween(activeNode, node);
+                        } else {
+                            selectInBetween(node, activeNode);
+                        }
+
                         node.setFocus(true);
                     }
                     else if (event.ctrlKey) {
                         const notePath = treeService.getNotePath(node);
                         appContext.tabManager.openTabWithNoteWithHoisting(notePath);
                     }
+                    else if (event.altKey) {
+                        node.setSelected(!node.isSelected());
+                        node.setFocus(true);
+                    }
                     else if (data.node.isActive()) {
                         // this is important for single column mobile view, otherwise it's not possible to see again previously displayed note
                         this.tree.reactivate(true);