Refactor (#862)

* Initial factoring out of parts of the LayerUI component

2360 → 2224 LOC

* Create a Section component

* Break up src/index.tsx

* Refactor actions to reduce duplication, fix CSS

Also consolidate icons

* Move scene/data.ts to its own directory

* Fix accidental reverts, banish further single-character variables

* ACTIVE_ELEM_COLOR → ACTIVE_ELEMENT_COLOR

* Further refactoring the icons file

* Log all errors

* Pointer Event polyfill to make the tests work

* add test hooks & fix tests

Co-authored-by: dwelle <luzar.david@gmail.com>

src/scene/selection.ts

@@ -82,3 +82,10 @@ export function getSelectedElements(
 ): readonly ExcalidrawElement[] {
   return elements.filter(element => element.isSelected);
 }
+
+export function getTargetElement(
+  editingElement: ExcalidrawElement | null,
+  elements: readonly ExcalidrawElement[],
+) {
+  return editingElement ? [editingElement] : getSelectedElements(elements);
+}