From 6f015a5a9dcc8b0c3a950efac1e972391d519c0f Mon Sep 17 00:00:00 2001
From: johnsonj <devnull@localhost>
Date: Thu, 10 Dec 2015 19:32:52 +1100
Subject: Do nothing for IME composition for read-only documents.

---
 qt/ScintillaEditBase/ScintillaEditBase.cpp | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'qt/ScintillaEditBase/ScintillaEditBase.cpp')

diff --git a/qt/ScintillaEditBase/ScintillaEditBase.cpp b/qt/ScintillaEditBase/ScintillaEditBase.cpp
index 6ca1ae1de..68cdc9e36 100644
--- a/qt/ScintillaEditBase/ScintillaEditBase.cpp
+++ b/qt/ScintillaEditBase/ScintillaEditBase.cpp
@@ -443,6 +443,11 @@ 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()) {
+		// Here, a canceling and/or completing composition function is needed.
+		return;
+	}
+
 	if (sqt->pdoc->TentativeActive()) {
 		sqt->pdoc->TentativeUndo();
 	} else {
-- 
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