From 00c0baf02262fdbbc1110ce1df7ba987ff952f09 Mon Sep 17 00:00:00 2001
From: Angus Leeming <leeming@lyx.org>
Date: Tue, 23 Jul 2002 14:47:31 +0000
Subject: [PATCH] Regenerate a preview only when leaving a math inset with
 depth 1.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@4763 a592a061-630c-0410-9148-cb99ea01b6c8
---
 src/mathed/ChangeLog        | 3 +++
 src/mathed/math_nestinset.C | 8 ++++++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/mathed/ChangeLog b/src/mathed/ChangeLog
index 3da70dd673..306f2f372d 100644
--- a/src/mathed/ChangeLog
+++ b/src/mathed/ChangeLog
@@ -3,6 +3,9 @@
 	* formula.C (descent): add an arbitrary 12 pixels to the descent when
 	previewing a display mode equation, analogous to André's code elsewhere.
 
+	* math_nestinset.C (notifyCursorLeaves): generate the preview only
+	when leaving an inset with depth() == 1.
+
 2002-07-22  Jean-Marc Lasgouttes  <lasgouttes@freesurf.fr>
 
 	* math_support.C (mathed_draw_deco): fix rounding bug for rotated
diff --git a/src/mathed/math_nestinset.C b/src/mathed/math_nestinset.C
index 520474d197..7cc4da7c80 100644
--- a/src/mathed/math_nestinset.C
+++ b/src/mathed/math_nestinset.C
@@ -277,12 +277,16 @@ MathArray MathNestInset::glue() const
 
 void MathNestInset::notifyCursorLeaves()
 {
-	//lyxerr << "leaving " << *this << "\n";
-	if (!mathcursor || !grfx::Previews::activated())
+	// Generate a preview only if previews are active and we are leaving
+	// the InsetFormula itself
+	if (!grfx::Previews::activated() ||
+	    !mathcursor || mathcursor->depth() != 1)
 		return;
 
 	InsetFormulaBase * inset = mathcursor->formula();
 	BufferView * bufferview = inset->view();
+
+	// Paranoia check
 	if (!bufferview || !bufferview->buffer())
 		return;