From 8e7a29f2fd09477eb41e2d5bd33d11ef04740c32 Mon Sep 17 00:00:00 2001
From: nyamatongwe <devnull@localhost>
Date: Thu, 26 Jul 2007 08:04:03 +0000
Subject: Optimised previous change to avoid extra redraws when modification
 does not affect visible area.

---
 include/Platform.h     | 3 +++
 src/Editor.cxx         | 6 +++++-
 win32/ScintillaWin.cxx | 2 +-
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/include/Platform.h b/include/Platform.h
index 6e6540007..79be33f6b 100644
--- a/include/Platform.h
+++ b/include/Platform.h
@@ -122,6 +122,9 @@ public:
 	}
 	int Width() { return right - left; }
 	int Height() { return bottom - top; }
+	bool Empty() { 
+		return (Height() <= 0) || (Width() <= 0);
+	}
 };
 
 /**
diff --git a/src/Editor.cxx b/src/Editor.cxx
index 187503256..4d10b6272 100644
--- a/src/Editor.cxx
+++ b/src/Editor.cxx
@@ -5471,7 +5471,11 @@ void Editor::SetFocusState(bool focusState) {
 }
 
 bool Editor::PaintContains(PRectangle rc) {
-	return rcPaint.Contains(rc);
+	if (rc.Empty()) {
+		return true;
+	} else {
+		return rcPaint.Contains(rc);
+	}
 }
 
 bool Editor::PaintContainsMargin() {
diff --git a/win32/ScintillaWin.cxx b/win32/ScintillaWin.cxx
index c7ed3ddfa..7fb12c97e 100644
--- a/win32/ScintillaWin.cxx
+++ b/win32/ScintillaWin.cxx
@@ -1069,7 +1069,7 @@ bool ScintillaWin::HaveMouseCapture() {
 
 bool ScintillaWin::PaintContains(PRectangle rc) {
 	bool contains = true;
-	if (paintState == painting) {
+	if ((paintState == painting) && (!rc.Empty())) {
 		if (!rcPaint.Contains(rc)) {
 			contains = false;
 		} else {
-- 
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