Fixed processing of the range totally outside the container

Author: oleksandr-danylchenko

packages/text-annotator/src/utils/trimRangeToContainer.ts

@@ -4,13 +4,31 @@ export const trimRangeToContainer = (
 ): Range => {
   const trimmedRange = range.cloneRange();
 
-  // If the start is outside the container - set it to the start of the container
-  if (!container.contains(trimmedRange.startContainer)) {
+  const containsStart = container.contains(trimmedRange.startContainer);
+  const containsEnd = container.contains(trimmedRange.endContainer);
+
+  /**
+   * If both the start and the end are outside the container -
+   * collapse such a range as irrelevant
+   */
+  if (!containsStart && !containsEnd) {
+    trimmedRange.collapse();
+    return trimmedRange;
+  }
+
+  /**
+   * If the range starts outside the container -
+   * trim it to the start of the container
+   */
+  if (!containsStart) {
     trimmedRange.setStart(container, 0);
   }
 
-  // If the end is outside the container - set it to the end of the container
-  if (!container.contains(trimmedRange.endContainer)) {
+  /**
+   * If the range ends outside the container -
+   * trim it to the end of the container
+   */
+  if (!containsEnd) {
     trimmedRange.setEnd(container, container.childNodes.length);
   }