9 files changed, 13 insertions, 25 deletions
diff --git a/doc/ScintillaHistory.html b/doc/ScintillaHistory.html
index e24bd5dc6..7a4b5b9bc 100644
--- a/doc/ScintillaHistory.html
+++ b/doc/ScintillaHistory.html
@@ -577,6 +577,19 @@
     </table>
     <h2>Releases</h2>
     <h3>
+       <a href="https://www.scintilla.org/scintilla531.zip">Release 5.3.1</a>
+    </h3>
+    <ul>
+	<li>
+	Released 27 August 2022.
+	</li>
+	<li>
+	Removed NotifyLexerChanged notification from DocWatcher.
+	This is a private interface but could be used by independent platform layers
+	and was exposed by ScintillaDocument in the Qt implementation of ScintillaEdit.
+	</li>
+    </ul>
+    <h3>
        <a href="https://www.scintilla.org/scintilla530.zip">Release 5.3.0</a>
     </h3>
     <ul>
diff --git a/qt/ScintillaEdit/ScintillaDocument.cpp b/qt/ScintillaEdit/ScintillaDocument.cpp
index 251a5e557..f14830010 100644
--- a/qt/ScintillaEdit/ScintillaDocument.cpp
+++ b/qt/ScintillaEdit/ScintillaDocument.cpp
@@ -54,7 +54,6 @@ public:
     void NotifyModified(Document *doc, DocModification mh, void *userData) override;
     void NotifyDeleted(Document *doc, void *userData) noexcept override;
     void NotifyStyleNeeded(Document *doc, void *userData, Sci::Position endPos) override;
-    void NotifyLexerChanged(Document *doc, void *userData) override;
     void NotifyErrorOccurred(Document *doc, void *userData, Status status) override;
 };
 
@@ -85,10 +84,6 @@ void WatcherHelper::NotifyStyleNeeded(Document *, void *, Sci::Position endPos)
     emit owner->style_needed(endPos);
 }
 
-void WatcherHelper::NotifyLexerChanged(Document *, void *) {
-    emit owner->lexer_changed();
-}
-
 void WatcherHelper::NotifyErrorOccurred(Document *, void *, Status status) {
     emit owner->error_occurred(static_cast<int>(status));
 }
diff --git a/qt/ScintillaEdit/ScintillaDocument.h b/qt/ScintillaEdit/ScintillaDocument.h
index 9a28689b6..579990781 100644
--- a/qt/ScintillaEdit/ScintillaDocument.h
+++ b/qt/ScintillaEdit/ScintillaDocument.h
@@ -82,7 +82,6 @@ signals:
     void modified(int position, int modification_type, const QByteArray &text, int length,
 		  int linesAdded, int line, int foldLevelNow, int foldLevelPrev);
     void style_needed(int pos);
-    void lexer_changed();
     void error_occurred(int status);
 
     friend class ::WatcherHelper;
diff --git a/src/Document.cxx b/src/Document.cxx
index 5e2613bdf..ada7f4436 100644
--- a/src/Document.cxx
+++ b/src/Document.cxx
@@ -58,7 +58,6 @@ LexInterface::~LexInterface() noexcept = default;
 
 void LexInterface::SetInstance(ILexer5 *instance_) {
 	instance.reset(instance_);
-	pdoc->LexerChanged();
 }
 
 void LexInterface::Colourise(Sci::Position start, Sci::Position end) {
@@ -2432,13 +2431,6 @@ void Document::StyleToAdjustingLineDuration(Sci::Position pos) {
 	durationStyleOneByte.AddSample(pos - stylingStart, epStyling.Duration());
 }
 
-void Document::LexerChanged() {
-	// Tell the watchers the lexer has changed.
-	for (const WatcherWithUserData &watcher : watchers) {
-		watcher.watcher->NotifyLexerChanged(this, watcher.userData);
-	}
-}
-
 LexInterface *Document::GetLexInterface() const noexcept {
 	return pli.get();
 }
diff --git a/src/Document.h b/src/Document.h
index 7daaf0f52..f08e0a302 100644
--- a/src/Document.h
+++ b/src/Document.h
@@ -484,7 +484,6 @@ public:
 	Sci::Position GetEndStyled() const noexcept { return endStyled; }
 	void EnsureStyledTo(Sci::Position pos);
 	void StyleToAdjustingLineDuration(Sci::Position pos);
-	void LexerChanged();
 	int GetStyleClock() const noexcept { return styleClock; }
 	void IncrementStyleClock() noexcept;
 	void SCI_METHOD DecorationSetCurrentIndicator(int indicator) override;
@@ -621,7 +620,6 @@ public:
 	virtual void NotifyModified(Document *doc, DocModification mh, void *userData) = 0;
 	virtual void NotifyDeleted(Document *doc, void *userData) noexcept = 0;
 	virtual void NotifyStyleNeeded(Document *doc, void *userData, Sci::Position endPos) = 0;
-	virtual void NotifyLexerChanged(Document *doc, void *userData) = 0;
 	virtual void NotifyErrorOccurred(Document *doc, void *userData, Scintilla::Status status) = 0;
 };
 
diff --git a/src/Editor.cxx b/src/Editor.cxx
index 8e8de16b1..32a63f14a 100644
--- a/src/Editor.cxx
+++ b/src/Editor.cxx
@@ -2379,9 +2379,6 @@ void Editor::NotifyStyleNeeded(Document *, void *, Sci::Position endStyleNeeded)
 	NotifyStyleToNeeded(endStyleNeeded);
 }
 
-void Editor::NotifyLexerChanged(Document *, void *) {
-}
-
 void Editor::NotifyErrorOccurred(Document *, void *, Status status) {
 	errorStatus = status;
 }
diff --git a/src/Editor.h b/src/Editor.h
index a30edff90..297590f47 100644
--- a/src/Editor.h
+++ b/src/Editor.h
@@ -471,7 +471,6 @@ protected:	// ScintillaBase subclass needs access to much of Editor
 	void NotifyModified(Document *document, DocModification mh, void *userData) override;
 	void NotifyDeleted(Document *document, void *userData) noexcept override;
 	void NotifyStyleNeeded(Document *doc, void *userData, Sci::Position endStyleNeeded) override;
-	void NotifyLexerChanged(Document *doc, void *userData) override;
 	void NotifyErrorOccurred(Document *doc, void *userData, Scintilla::Status status) override;
 	void NotifyMacroRecord(Scintilla::Message iMessage, Scintilla::uptr_t wParam, Scintilla::sptr_t lParam);
 
diff --git a/src/ScintillaBase.cxx b/src/ScintillaBase.cxx
index 979a8b07f..e72f1b1d6 100644
--- a/src/ScintillaBase.cxx
+++ b/src/ScintillaBase.cxx
@@ -809,10 +809,6 @@ void ScintillaBase::NotifyStyleToNeeded(Sci::Position endStyleNeeded) {
 	Editor::NotifyStyleToNeeded(endStyleNeeded);
 }
 
-void ScintillaBase::NotifyLexerChanged(Document *, void *) {
-	vs.EnsureStyle(0xff);
-}
-
 sptr_t ScintillaBase::WndProc(Message iMessage, uptr_t wParam, sptr_t lParam) {
 	switch (iMessage) {
 	case Message::AutoCShow:
diff --git a/src/ScintillaBase.h b/src/ScintillaBase.h
index 47e24796d..3cfad8684 100644
--- a/src/ScintillaBase.h
+++ b/src/ScintillaBase.h
@@ -82,7 +82,6 @@ protected:
 	void RightButtonDownWithModifiers(Point pt, unsigned int curTime, Scintilla::KeyMod modifiers) override;
 
 	void NotifyStyleToNeeded(Sci::Position endStyleNeeded) override;
-	void NotifyLexerChanged(Document *doc, void *userData) override;
 
 public:
 	~ScintillaBase() override;