diff --git a/src/plugins/cppeditor/cppvirtualfunctionassistprovider.cpp b/src/plugins/cppeditor/cppvirtualfunctionassistprovider.cpp
index 74444e0e793..e2e3accffe3 100644
--- a/src/plugins/cppeditor/cppvirtualfunctionassistprovider.cpp
+++ b/src/plugins/cppeditor/cppvirtualfunctionassistprovider.cpp
@@ -106,9 +106,9 @@ public:
                             bool openInSplit)
         : GenericProposal(cursorPos, items)
         , m_openInSplit(openInSplit)
-    {}
-
-    bool isFragile() const override { return true; }
+    {
+        setFragile(true);
+    }
 
     IAssistProposalWidget *createWidget() const override
     { return new VirtualFunctionProposalWidget(m_openInSplit); }
diff --git a/src/plugins/texteditor/codeassist/functionhintproposal.cpp b/src/plugins/texteditor/codeassist/functionhintproposal.cpp
index 5a2bb07cfd6..048ce8da569 100644
--- a/src/plugins/texteditor/codeassist/functionhintproposal.cpp
+++ b/src/plugins/texteditor/codeassist/functionhintproposal.cpp
@@ -32,16 +32,13 @@ using namespace TextEditor;
 FunctionHintProposal::FunctionHintProposal(int cursorPos, IFunctionHintProposalModel *model)
     : IAssistProposal(cursorPos)
     , m_model(model)
-{}
+{
+    setFragile(true);
+}
 
 FunctionHintProposal::~FunctionHintProposal()
 {}
 
-bool FunctionHintProposal::isFragile() const
-{
-    return true;
-}
-
 IAssistProposalModel *FunctionHintProposal::model() const
 {
     return m_model;
diff --git a/src/plugins/texteditor/codeassist/functionhintproposal.h b/src/plugins/texteditor/codeassist/functionhintproposal.h
index fd73886b056..53746534541 100644
--- a/src/plugins/texteditor/codeassist/functionhintproposal.h
+++ b/src/plugins/texteditor/codeassist/functionhintproposal.h
@@ -38,7 +38,6 @@ public:
     FunctionHintProposal(int cursorPos, IFunctionHintProposalModel *model);
     ~FunctionHintProposal();
 
-    bool isFragile() const override;
     IAssistProposalModel *model() const override;
     IAssistProposalWidget *createWidget() const override;
 
diff --git a/src/plugins/texteditor/codeassist/genericproposal.cpp b/src/plugins/texteditor/codeassist/genericproposal.cpp
index 5feac5810b8..33fb0c547f3 100644
--- a/src/plugins/texteditor/codeassist/genericproposal.cpp
+++ b/src/plugins/texteditor/codeassist/genericproposal.cpp
@@ -44,11 +44,6 @@ GenericProposal::GenericProposal(int cursorPos, const QList<AssistProposalItemIn
 GenericProposal::~GenericProposal()
 {}
 
-bool GenericProposal::isFragile() const
-{
-    return false;
-}
-
 bool GenericProposal::hasItemsToPropose(const QString &prefix, AssistReason reason) const
 {
     if (!prefix.isEmpty()) {
diff --git a/src/plugins/texteditor/codeassist/genericproposal.h b/src/plugins/texteditor/codeassist/genericproposal.h
index 385f9978df7..1155ab52ad4 100644
--- a/src/plugins/texteditor/codeassist/genericproposal.h
+++ b/src/plugins/texteditor/codeassist/genericproposal.h
@@ -40,7 +40,6 @@ public:
     GenericProposal(int cursorPos, const QList<AssistProposalItemInterface *> &items);
     ~GenericProposal();
 
-    bool isFragile() const override;
     bool hasItemsToPropose(const QString &prefix, AssistReason reason) const override;
     IAssistProposalModel *model() const override;
     IAssistProposalWidget *createWidget() const override;
diff --git a/src/plugins/texteditor/codeassist/iassistproposal.cpp b/src/plugins/texteditor/codeassist/iassistproposal.cpp
index 2880235ac2a..fcbe2e83862 100644
--- a/src/plugins/texteditor/codeassist/iassistproposal.cpp
+++ b/src/plugins/texteditor/codeassist/iassistproposal.cpp
@@ -85,6 +85,11 @@ int IAssistProposal::basePosition() const
     return m_basePosition;
 }
 
+bool IAssistProposal::isFragile() const
+{
+    return m_isFragile;
+}
+
 /*!
     \fn bool TextEditor::IAssistProposal::isCorrective() const
 
@@ -110,6 +115,11 @@ void IAssistProposal::makeCorrection(TextEditorWidget *editorWidget)
     Q_UNUSED(editorWidget);
 }
 
+void IAssistProposal::setFragile(bool fragile)
+{
+    m_isFragile = fragile;
+}
+
 /*!
     \fn IAssistModel *TextEditor::IAssistProposal::model() const
 
diff --git a/src/plugins/texteditor/codeassist/iassistproposal.h b/src/plugins/texteditor/codeassist/iassistproposal.h
index 732fe9a4689..4e93993dc26 100644
--- a/src/plugins/texteditor/codeassist/iassistproposal.h
+++ b/src/plugins/texteditor/codeassist/iassistproposal.h
@@ -42,15 +42,17 @@ public:
     virtual ~IAssistProposal();
 
     int basePosition() const;
+    bool isFragile() const;
     virtual bool hasItemsToPropose(const QString &, AssistReason) const { return true; }
-    virtual bool isFragile() const = 0;
     virtual bool isCorrective(TextEditorWidget *editorWidget) const;
     virtual void makeCorrection(TextEditorWidget *editorWidget);
     virtual IAssistProposalModel *model() const = 0;
     virtual IAssistProposalWidget *createWidget() const = 0;
 
+    void setFragile(bool fragile);
 protected:
     int m_basePosition;
+    bool m_isFragile = false;
 };
 
 } // TextEditor