인라인 텍스트 색상 패널 추가

lib/markdown-live-selection.js

@@ -100,16 +100,17 @@ export const rangeIntersectsElement = (range, element) => {
  * @returns {number}
  */
 export const getSelectionOffsetInElement = (element, range, edge) => {
-  const partial = document.createRange()
-  partial.selectNodeContents(element)
+  const boundaryRange = document.createRange()
 
   if (edge === 'start') {
-    partial.setEnd(range.startContainer, range.startOffset)
+    boundaryRange.setStart(range.startContainer, range.startOffset)
   } else {
-    partial.setStart(range.endContainer, range.endOffset)
+    boundaryRange.setStart(range.endContainer, range.endOffset)
   }
 
-  return getEditableCaretOffset(element, partial)
+  boundaryRange.collapse(true)
+
+  return getEditableCaretOffset(element, boundaryRange)
 }
 
 /**