1 files changed, 3 insertions, 2 deletions
diff --git a/src/widgets/widgets/qplaintextedit.cpp b/src/widgets/widgets/qplaintextedit.cpp
index 6ed1aeff72..23c1e99231 100644
--- a/src/widgets/widgets/qplaintextedit.cpp
+++ b/src/widgets/widgets/qplaintextedit.cpp
@@ -284,14 +284,15 @@ void QPlainTextDocumentLayoutPrivate::relayout()
 
 /*! \reimp
  */
-void QPlainTextDocumentLayout::documentChanged(int from, int /*charsRemoved*/, int charsAdded)
+void QPlainTextDocumentLayout::documentChanged(int from, int charsRemoved, int charsAdded)
 {
     Q_D(QPlainTextDocumentLayout);
     QTextDocument *doc = document();
     int newBlockCount = doc->blockCount();
+    int charsChanged = qMax(charsRemoved, charsAdded);
 
     QTextBlock changeStartBlock = doc->findBlock(from);
-    QTextBlock changeEndBlock = doc->findBlock(qMax(0, from + charsAdded - 1));
+    QTextBlock changeEndBlock = doc->findBlock(qMax(0, from + charsChanged - 1));
 
     if (changeStartBlock == changeEndBlock && newBlockCount == d->blockCount) {
         QTextBlock block = changeStartBlock;