Add more highlighter color choices (#7012)

* Add more highlighter color choices, closes #7011

* docs

shared/editor/queries/getMarksBetween.ts

@@ -0,0 +1,31 @@
+import { Mark } from "prosemirror-model";
+import { EditorState } from "prosemirror-state";
+
+/**
+ * Get all marks that are applied to text between two positions.
+ *
+ * @param start The start position
+ * @param end The end position
+ * @param state The editor state
+ * @returns A list of marks
+ */
+export function getMarksBetween(
+  start: number,
+  end: number,
+  state: EditorState
+) {
+  let marks: { start: number; end: number; mark: Mark }[] = [];
+
+  state.doc.nodesBetween(start, end, (node, pos) => {
+    marks = [
+      ...marks,
+      ...node.marks.map((mark) => ({
+        start: pos,
+        end: pos + node.nodeSize,
+        mark,
+      })),
+    ];
+  });
+
+  return marks;
+}