From 20e5273f5b6208576bf9bc900e4cff39d724cb7f Mon Sep 17 00:00:00 2001
From: fvogel <fvogelnew1@free.fr>
Date: Sat, 5 Dec 2015 13:31:00 +0000
Subject: Fix for bug [ff8a1e55a2] - Filling a never-mapped text widget is CPU
 hungry - Patch from Koen Danckaert

---
 generic/tkTextDisp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/generic/tkTextDisp.c b/generic/tkTextDisp.c
index cfe6e7a..0665ba7 100644
--- a/generic/tkTextDisp.c
+++ b/generic/tkTextDisp.c
@@ -2923,7 +2923,8 @@ AsyncUpdateLineMetrics(
 	return;
     }
 
-    if (dInfoPtr->flags & REDRAW_PENDING) {
+    if ((dInfoPtr->flags & REDRAW_PENDING) || !Tk_IsMapped(textPtr->tkwin)
+        || dInfoPtr->maxX <= dInfoPtr->x || dInfoPtr->maxY <= dInfoPtr->y) {
 	dInfoPtr->lineUpdateTimer = Tcl_CreateTimerHandler(1,
 		AsyncUpdateLineMetrics, clientData);
 	return;
-- 
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