From 363809c7e0df6a142a7dfe6d7013c42cd9d72ba0 Mon Sep 17 00:00:00 2001
From: Abdelrazak Younes <younes@lyx.org>
Date: Sun, 20 Dec 2009 15:43:52 +0000
Subject: [PATCH] Disallow multiple concurrent previews as we are not ready for
 that.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@32603 a592a061-630c-0410-9148-cb99ea01b6c8
---
 src/frontends/qt4/GuiView.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/frontends/qt4/GuiView.cpp b/src/frontends/qt4/GuiView.cpp
index 0cc79708ec..de7d60e125 100644
--- a/src/frontends/qt4/GuiView.cpp
+++ b/src/frontends/qt4/GuiView.cpp
@@ -268,6 +268,8 @@ struct GuiView::GuiViewPrivate
 
 	void setPreviewFuture(QFuture<docstring> const & f)
 	{
+		if (preview_watcher_.isRunning())
+			preview_watcher_.waitForFinished();
 		preview_watcher_.setFuture(f);
 		connect(&preview_watcher_, SIGNAL(finished()), gv_,
 			SLOT(threadFinished()));
@@ -1312,12 +1314,13 @@ bool GuiView::getStatus(FuncRequest const & cmd, FuncStatus & flag)
 
 	case LFUN_MASTER_BUFFER_UPDATE:
 	case LFUN_MASTER_BUFFER_VIEW: 
-		enable = doc_buffer && doc_buffer->parent() != 0;
+		enable = doc_buffer && doc_buffer->parent() != 0
+			&& !d.preview_watcher_.isRunning();
 		break;
 
 	case LFUN_BUFFER_UPDATE:
 	case LFUN_BUFFER_VIEW: {
-		if (!doc_buffer) {
+		if (!doc_buffer || d.preview_watcher_.isRunning()) {
 			enable = false;
 			break;
 		}
-- 
2.39.2