diff --git a/bms-front/src/directive/common/textDragCopy.js b/bms-front/src/directive/common/textDragCopy.js
index 00a55684..c451608d 100644
--- a/bms-front/src/directive/common/textDragCopy.js
+++ b/bms-front/src/directive/common/textDragCopy.js
@@ -250,10 +250,18 @@ function handleClick(event) {
   suppressClickRoot = null
 }
 
+function handleFocusIn(event) {
+  if (!activeSelection) return
+  const target = event.target instanceof Element ? event.target : event.target?.parentElement
+  if (!target) return
+
+  if (!activeSelection.context.el.contains(target) || target.closest(EDITABLE_SELECTOR)) {
+    clearSelection()
+  }
+}
+
 function handleCopy(event) {
   if (!activeSelection || dragging || !event.clipboardData) return
-  const target = event.target instanceof Element ? event.target : event.target?.parentElement
-  if (target?.closest(EDITABLE_SELECTOR)) return
 
   const text = selectedTextSegments().map(segment => segment.text).join('\n')
   if (!text) return
@@ -268,6 +276,7 @@ function installListeners() {
   document.addEventListener('mouseup', handleMouseUp)
   document.addEventListener('dblclick', handleDoubleClick)
   document.addEventListener('click', handleClick, true)
+  document.addEventListener('focusin', handleFocusIn, true)
   document.addEventListener('copy', handleCopy, true)
   listenersInstalled = true
 }
@@ -279,6 +288,7 @@ function removeListeners() {
   document.removeEventListener('mouseup', handleMouseUp)
   document.removeEventListener('dblclick', handleDoubleClick)
   document.removeEventListener('click', handleClick, true)
+  document.removeEventListener('focusin', handleFocusIn, true)
   document.removeEventListener('copy', handleCopy, true)
   listenersInstalled = false
 }