From a2dd3d187967cd838747329dc37382796b01ad4f Mon Sep 17 00:00:00 2001
From: johnsonj <devnull@localhost>
Date: Mon, 14 Dec 2015 15:03:51 +1100
Subject: Block IME when some selected text is protected.

---
 doc/ScintillaHistory.html                  | 4 ++++
 gtk/ScintillaGTK.cxx                       | 2 +-
 qt/ScintillaEditBase/ScintillaEditBase.cpp | 2 +-
 win32/ScintillaWin.cxx                     | 2 +-
 4 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/doc/ScintillaHistory.html b/doc/ScintillaHistory.html
index 57680f59a..29e664b12 100644
--- a/doc/ScintillaHistory.html
+++ b/doc/ScintillaHistory.html
@@ -541,6 +541,10 @@
 	On GTK+ and Qt, Korean input by word fixed.
 	</li>
 	<li>
+	On GTK+, Qt, and Win32 block IME input when document is read-only or any selected text
+	is protected.
+	</li>
+	<li>
 	On GTK+ on OS X, fix warning during destruction.
 	<a href="http://sourceforge.net/p/scintilla/bugs/1777/">Bug #1777</a>.
 	</li>
diff --git a/gtk/ScintillaGTK.cxx b/gtk/ScintillaGTK.cxx
index 19576ce9e..eaf2e26f8 100644
--- a/gtk/ScintillaGTK.cxx
+++ b/gtk/ScintillaGTK.cxx
@@ -2434,7 +2434,7 @@ void ScintillaGTK::PreeditChangedInlineThis() {
 	// Copy & paste by johnsonj with a lot of helps of Neil
 	// Great thanks for my foreruners, jiniya and BLUEnLIVE
 	try {
-		if (pdoc->IsReadOnly()) {
+		if (pdoc->IsReadOnly() || SelectionContainsProtected()) {
 			gtk_im_context_reset(im_context);
 			return;
 		}
diff --git a/qt/ScintillaEditBase/ScintillaEditBase.cpp b/qt/ScintillaEditBase/ScintillaEditBase.cpp
index ea516fe17..13401fedf 100644
--- a/qt/ScintillaEditBase/ScintillaEditBase.cpp
+++ b/qt/ScintillaEditBase/ScintillaEditBase.cpp
@@ -443,7 +443,7 @@ void ScintillaEditBase::inputMethodEvent(QInputMethodEvent *event)
 	// Copy & paste by johnsonj with a lot of helps of Neil
 	// Great thanks for my forerunners, jiniya and BLUEnLIVE
 
-	if (sqt->pdoc->IsReadOnly()) {
+	if (sqt->pdoc->IsReadOnly() || sqt->SelectionContainsProtected()) {
 		// Here, a canceling and/or completing composition function is needed.
 		return;
 	}
diff --git a/win32/ScintillaWin.cxx b/win32/ScintillaWin.cxx
index b97a39ff3..f536482a1 100644
--- a/win32/ScintillaWin.cxx
+++ b/win32/ScintillaWin.cxx
@@ -1007,7 +1007,7 @@ sptr_t ScintillaWin::HandleCompositionInline(uptr_t, sptr_t lParam) {
 	IMContext imc(MainHWND());
 	if (!imc.hIMC)
 		return 0;
-	if (pdoc->IsReadOnly()) {
+	if (pdoc->IsReadOnly() || SelectionContainsProtected()) {
 		::ImmNotifyIME(imc.hIMC, NI_COMPOSITIONSTR, CPS_CANCEL, 0);
 		return 0;
 	}
-- 
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