diff --git a/src/plugins/android/javacompletionassistprovider.cpp b/src/plugins/android/javacompletionassistprovider.cpp
index dd15a375070..a237c570add 100644
--- a/src/plugins/android/javacompletionassistprovider.cpp
+++ b/src/plugins/android/javacompletionassistprovider.cpp
@@ -102,11 +102,6 @@ void JavaCompletionAssistProvider::init() const
         m_keywords.append(QLatin1String(keywords[i]));
 }
 
-bool JavaCompletionAssistProvider::supportsEditor(Core::Id editorId) const
-{
-    return editorId == Constants::JAVA_EDITOR_ID;
-}
-
 TextEditor::IAssistProcessor *JavaCompletionAssistProvider::createProcessor() const
 {
     if (m_keywords.isEmpty())
diff --git a/src/plugins/android/javacompletionassistprovider.h b/src/plugins/android/javacompletionassistprovider.h
index f58685250fb..277f5c45476 100644
--- a/src/plugins/android/javacompletionassistprovider.h
+++ b/src/plugins/android/javacompletionassistprovider.h
@@ -42,7 +42,6 @@ public:
 
     void init() const;
 
-    bool supportsEditor(Core::Id editorId) const;
     TextEditor::IAssistProcessor *createProcessor() const;
 
 private:
diff --git a/src/plugins/cmakeprojectmanager/cmakefilecompletionassist.cpp b/src/plugins/cmakeprojectmanager/cmakefilecompletionassist.cpp
index 49bfcde8f39..7f33bdd20fa 100644
--- a/src/plugins/cmakeprojectmanager/cmakefilecompletionassist.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakefilecompletionassist.cpp
@@ -47,11 +47,6 @@ using namespace ProjectExplorer;
 // CMakeFileCompletionAssistProvider
 // -------------------------------
 
-bool CMakeFileCompletionAssistProvider::supportsEditor(Core::Id editorId) const
-{
-    return editorId == CMakeProjectManager::Constants::CMAKE_EDITOR_ID;
-}
-
 IAssistProcessor *CMakeFileCompletionAssistProvider::createProcessor() const
 {
     return new CMakeFileCompletionAssist;
diff --git a/src/plugins/cmakeprojectmanager/cmakefilecompletionassist.h b/src/plugins/cmakeprojectmanager/cmakefilecompletionassist.h
index 68d01443307..934d7b64e88 100644
--- a/src/plugins/cmakeprojectmanager/cmakefilecompletionassist.h
+++ b/src/plugins/cmakeprojectmanager/cmakefilecompletionassist.h
@@ -47,7 +47,6 @@ class CMakeFileCompletionAssistProvider : public TextEditor::CompletionAssistPro
     Q_OBJECT
 
 public:
-    bool supportsEditor(Core::Id editorId) const override;
     TextEditor::IAssistProcessor *createProcessor() const override;
 };
 
diff --git a/src/plugins/cppeditor/cppquickfixassistant.cpp b/src/plugins/cppeditor/cppquickfixassistant.cpp
index 0682c81efe5..bde1f759bc6 100644
--- a/src/plugins/cppeditor/cppquickfixassistant.cpp
+++ b/src/plugins/cppeditor/cppquickfixassistant.cpp
@@ -51,11 +51,6 @@ IAssistProvider::RunType CppQuickFixAssistProvider::runType() const
     return Synchronous;
 }
 
-bool CppQuickFixAssistProvider::supportsEditor(Core::Id editorId) const
-{
-    return editorId == Constants::CPPEDITOR_ID;
-}
-
 IAssistProcessor *CppQuickFixAssistProvider::createProcessor() const
 {
     return new QuickFixAssistProcessor(this);
diff --git a/src/plugins/cppeditor/cppquickfixassistant.h b/src/plugins/cppeditor/cppquickfixassistant.h
index 20a1b739802..9d24442d1bd 100644
--- a/src/plugins/cppeditor/cppquickfixassistant.h
+++ b/src/plugins/cppeditor/cppquickfixassistant.h
@@ -73,7 +73,6 @@ class CppQuickFixAssistProvider : public TextEditor::QuickFixAssistProvider
 public:
     CppQuickFixAssistProvider(QObject *parent = 0) : TextEditor::QuickFixAssistProvider(parent) {}
     IAssistProvider::RunType runType() const override;
-    bool supportsEditor(Core::Id editorId) const override;
     TextEditor::IAssistProcessor *createProcessor() const override;
 
     QList<TextEditor::QuickFixFactory *> quickFixFactories() const override;
diff --git a/src/plugins/cppeditor/cppvirtualfunctionassistprovider.cpp b/src/plugins/cppeditor/cppvirtualfunctionassistprovider.cpp
index b4886d9ea08..74444e0e793 100644
--- a/src/plugins/cppeditor/cppvirtualfunctionassistprovider.cpp
+++ b/src/plugins/cppeditor/cppvirtualfunctionassistprovider.cpp
@@ -207,11 +207,6 @@ IAssistProvider::RunType VirtualFunctionAssistProvider::runType() const
     return AsynchronousWithThread;
 }
 
-bool VirtualFunctionAssistProvider::supportsEditor(Core::Id editorId) const
-{
-    return editorId == Constants::CPPEDITOR_ID;
-}
-
 IAssistProcessor *VirtualFunctionAssistProvider::createProcessor() const
 {
     return new VirtualFunctionAssistProcessor(m_params);
diff --git a/src/plugins/cppeditor/cppvirtualfunctionassistprovider.h b/src/plugins/cppeditor/cppvirtualfunctionassistprovider.h
index 5a930530b58..363981b7ca6 100644
--- a/src/plugins/cppeditor/cppvirtualfunctionassistprovider.h
+++ b/src/plugins/cppeditor/cppvirtualfunctionassistprovider.h
@@ -58,7 +58,6 @@ public:
     void clearParams() { m_params = Parameters(); }
 
     IAssistProvider::RunType runType() const override;
-    bool supportsEditor(Core::Id editorId) const override;
     TextEditor::IAssistProcessor *createProcessor() const override;
 
 private:
diff --git a/src/plugins/cpptools/cppcompletionassistprovider.cpp b/src/plugins/cpptools/cppcompletionassistprovider.cpp
index ec7e58839ca..b5f4ca51ab5 100644
--- a/src/plugins/cpptools/cppcompletionassistprovider.cpp
+++ b/src/plugins/cpptools/cppcompletionassistprovider.cpp
@@ -41,11 +41,6 @@ CppCompletionAssistProvider::CppCompletionAssistProvider(QObject *parent)
     : TextEditor::CompletionAssistProvider(parent)
 {}
 
-bool CppCompletionAssistProvider::supportsEditor(Core::Id editorId) const
-{
-    return editorId == CppEditor::Constants::CPPEDITOR_ID;
-}
-
 int CppCompletionAssistProvider::activationCharSequenceLength() const
 {
     return 3;
diff --git a/src/plugins/cpptools/cppcompletionassistprovider.h b/src/plugins/cpptools/cppcompletionassistprovider.h
index 85f9657c62e..c2188b9d388 100644
--- a/src/plugins/cpptools/cppcompletionassistprovider.h
+++ b/src/plugins/cpptools/cppcompletionassistprovider.h
@@ -49,7 +49,6 @@ class CPPTOOLS_EXPORT CppCompletionAssistProvider : public TextEditor::Completio
 
 public:
     CppCompletionAssistProvider(QObject *parent = 0);
-    bool supportsEditor(Core::Id editorId) const override;
     int activationCharSequenceLength() const override;
     bool isActivationCharSequence(const QString &sequence) const override;
     bool isContinuationChar(const QChar &c) const override;
diff --git a/src/plugins/fakevim/fakevimplugin.cpp b/src/plugins/fakevim/fakevimplugin.cpp
index b968b857e1c..a7f87c7ee43 100644
--- a/src/plugins/fakevim/fakevimplugin.cpp
+++ b/src/plugins/fakevim/fakevimplugin.cpp
@@ -863,11 +863,6 @@ void FakeVimUserCommandsPage::apply()
 class FakeVimCompletionAssistProvider : public CompletionAssistProvider
 {
 public:
-    bool supportsEditor(Id ) const
-    {
-        return false;
-    }
-
     IAssistProcessor *createProcessor() const;
 
     void setActive(const QString &needle, bool forward, FakeVimHandler *handler)
diff --git a/src/plugins/glsleditor/glslcompletionassist.cpp b/src/plugins/glsleditor/glslcompletionassist.cpp
index 9be913279e7..a9ced66128e 100644
--- a/src/plugins/glsleditor/glslcompletionassist.cpp
+++ b/src/plugins/glsleditor/glslcompletionassist.cpp
@@ -194,11 +194,6 @@ static QIcon glslIcon(IconTypes iconType)
 // ----------------------------
 // GlslCompletionAssistProvider
 // ----------------------------
-bool GlslCompletionAssistProvider::supportsEditor(Core::Id editorId) const
-{
-    return editorId == Constants::C_GLSLEDITOR_ID;
-}
-
 IAssistProcessor *GlslCompletionAssistProvider::createProcessor() const
 {
     return new GlslCompletionAssistProcessor;
diff --git a/src/plugins/glsleditor/glslcompletionassist.h b/src/plugins/glsleditor/glslcompletionassist.h
index 234b6331f0b..d09537fec15 100644
--- a/src/plugins/glsleditor/glslcompletionassist.h
+++ b/src/plugins/glsleditor/glslcompletionassist.h
@@ -84,7 +84,6 @@ class GlslCompletionAssistProvider : public TextEditor::CompletionAssistProvider
     Q_OBJECT
 
 public:
-    bool supportsEditor(Core::Id editorId) const override;
     TextEditor::IAssistProcessor *createProcessor() const override;
 
     int activationCharSequenceLength() const override;
diff --git a/src/plugins/qmakeprojectmanager/profilecompletionassist.cpp b/src/plugins/qmakeprojectmanager/profilecompletionassist.cpp
index 86f3a67cef9..c1abcc2a6fa 100644
--- a/src/plugins/qmakeprojectmanager/profilecompletionassist.cpp
+++ b/src/plugins/qmakeprojectmanager/profilecompletionassist.cpp
@@ -328,11 +328,6 @@ ProFileCompletionAssistProvider::~ProFileCompletionAssistProvider()
 {
 }
 
-bool ProFileCompletionAssistProvider::supportsEditor(Core::Id editorId) const
-{
-    return editorId == QmakeProjectManager::Constants::PROFILE_EDITOR_ID;
-}
-
 IAssistProcessor *ProFileCompletionAssistProvider::createProcessor() const
 {
     if (m_variables.isEmpty())
diff --git a/src/plugins/qmakeprojectmanager/profilecompletionassist.h b/src/plugins/qmakeprojectmanager/profilecompletionassist.h
index a63f3e7a8d5..76c77a95f06 100644
--- a/src/plugins/qmakeprojectmanager/profilecompletionassist.h
+++ b/src/plugins/qmakeprojectmanager/profilecompletionassist.h
@@ -40,7 +40,6 @@ public:
     void init();
     ~ProFileCompletionAssistProvider();
 
-    bool supportsEditor(Core::Id editorId) const override;
     TextEditor::IAssistProcessor *createProcessor() const override;
     QStringList variables() const;
     QStringList functions() const;
diff --git a/src/plugins/qmljseditor/qmljscompletionassist.cpp b/src/plugins/qmljseditor/qmljscompletionassist.cpp
index f662bc83b6e..fa7615dc73e 100644
--- a/src/plugins/qmljseditor/qmljscompletionassist.cpp
+++ b/src/plugins/qmljseditor/qmljscompletionassist.cpp
@@ -505,11 +505,6 @@ int FunctionHintProposalModel::activeArgument(const QString &prefix) const
 // -----------------------------
 // QmlJSCompletionAssistProvider
 // -----------------------------
-bool QmlJSCompletionAssistProvider::supportsEditor(Core::Id editorId) const
-{
-    return editorId == Constants::C_QMLJSEDITOR_ID;
-}
-
 int QmlJSCompletionAssistProvider::activationCharSequenceLength() const
 {
     return 1;
diff --git a/src/plugins/qmljseditor/qmljscompletionassist.h b/src/plugins/qmljseditor/qmljscompletionassist.h
index 8c05106258a..0eb5a31983d 100644
--- a/src/plugins/qmljseditor/qmljscompletionassist.h
+++ b/src/plugins/qmljseditor/qmljscompletionassist.h
@@ -76,7 +76,6 @@ class QmlJSCompletionAssistProvider : public TextEditor::CompletionAssistProvide
     Q_OBJECT
 
 public:
-    bool supportsEditor(Core::Id editorId) const override;
     TextEditor::IAssistProcessor *createProcessor() const override;
 
     int activationCharSequenceLength() const override;
diff --git a/src/plugins/qmljseditor/qmljsquickfixassist.cpp b/src/plugins/qmljseditor/qmljsquickfixassist.cpp
index 344a58031be..1138a1341e8 100644
--- a/src/plugins/qmljseditor/qmljsquickfixassist.cpp
+++ b/src/plugins/qmljseditor/qmljsquickfixassist.cpp
@@ -78,11 +78,6 @@ IAssistProvider::RunType QmlJSQuickFixAssistProvider::runType() const
     return Synchronous;
 }
 
-bool QmlJSQuickFixAssistProvider::supportsEditor(Core::Id editorId) const
-{
-    return editorId == Constants::C_QMLJSEDITOR_ID;
-}
-
 IAssistProcessor *QmlJSQuickFixAssistProvider::createProcessor() const
 {
     return new QuickFixAssistProcessor(this);
diff --git a/src/plugins/qmljseditor/qmljsquickfixassist.h b/src/plugins/qmljseditor/qmljsquickfixassist.h
index 50f26ecb6ed..89e7247366b 100644
--- a/src/plugins/qmljseditor/qmljsquickfixassist.h
+++ b/src/plugins/qmljseditor/qmljsquickfixassist.h
@@ -59,7 +59,6 @@ public:
     ~QmlJSQuickFixAssistProvider();
 
     IAssistProvider::RunType runType() const override;
-    bool supportsEditor(Core::Id editorId) const override;
     TextEditor::IAssistProcessor *createProcessor() const override;
 
     QList<TextEditor::QuickFixFactory *> quickFixFactories() const override;
diff --git a/src/plugins/texteditor/circularclipboardassist.cpp b/src/plugins/texteditor/circularclipboardassist.cpp
index 0941a83bfec..65034a39cdd 100644
--- a/src/plugins/texteditor/circularclipboardassist.cpp
+++ b/src/plugins/texteditor/circularclipboardassist.cpp
@@ -113,11 +113,6 @@ IAssistProvider::RunType ClipboardAssistProvider::runType() const
     return Synchronous;
 }
 
-bool ClipboardAssistProvider::supportsEditor(Core::Id /*editorId*/) const
-{
-    return true;
-}
-
 IAssistProcessor *ClipboardAssistProvider::createProcessor() const
 {
     return new ClipboardAssistProcessor;
diff --git a/src/plugins/texteditor/circularclipboardassist.h b/src/plugins/texteditor/circularclipboardassist.h
index a15101669f9..4542d1cf771 100644
--- a/src/plugins/texteditor/circularclipboardassist.h
+++ b/src/plugins/texteditor/circularclipboardassist.h
@@ -36,7 +36,6 @@ class ClipboardAssistProvider: public IAssistProvider
 public:
     ClipboardAssistProvider(QObject *parent = 0) : IAssistProvider(parent) {}
     IAssistProvider::RunType runType() const override;
-    bool supportsEditor(Core::Id editorId) const override;
     IAssistProcessor *createProcessor() const override;
 };
 
diff --git a/src/plugins/texteditor/codeassist/iassistprovider.h b/src/plugins/texteditor/codeassist/iassistprovider.h
index 22b6193202a..0146e87829f 100644
--- a/src/plugins/texteditor/codeassist/iassistprovider.h
+++ b/src/plugins/texteditor/codeassist/iassistprovider.h
@@ -48,7 +48,6 @@ public:
     };
 
     virtual RunType runType() const = 0;
-    virtual bool supportsEditor(Core::Id editorId) const = 0;
     virtual IAssistProcessor *createProcessor() const = 0;
 };