From 3beb38c92e81eae0c321ebfcdb857265d91f6a3c Mon Sep 17 00:00:00 2001
From: Enrico Forestieri <forenr@lyx.org>
Date: Thu, 6 Dec 2018 10:30:58 +0100
Subject: [PATCH] Amend bd21aa9

Check whether a line is actually blank rather than whether
we are at the beginning of a line.

(cherry picked from commit 976e0b79933e162070ef3d2973fb0c899f8bdf54)
---
 ANNOUNCE        | 2 ++
 src/Changes.cpp | 2 +-
 src/texstream.h | 7 ++++++-
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/ANNOUNCE b/ANNOUNCE
index 2b9171b2b1..f9f8e964a4 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -164,6 +164,8 @@ What's new
 
 - Fix loading order conflict with beamer-article and covington.
 
+- Preserve a new paragraph after a float (bug 11398).
+
 
 
 * USER INTERFACE
diff --git a/src/Changes.cpp b/src/Changes.cpp
index 5f8e3b21bf..6e3bf0fff7 100644
--- a/src/Changes.cpp
+++ b/src/Changes.cpp
@@ -428,7 +428,7 @@ int Changes::latexMarkChange(otexstream & os, BufferParams const & bparams,
 	// signature needed by \lyxsout to correctly strike out display math
 	if (change.type == Change::DELETED && runparams.inDisplayMath
 	    && !dvipost) {
-		if (os.lastChar() == '\n')
+		if (os.blankLine())
 			str += from_ascii("\\\\\\noindent\n");
 		else
 			str += from_ascii("\\\\\\\\\n");
diff --git a/src/texstream.h b/src/texstream.h
index 2cfcd16da4..a14f84bf95 100644
--- a/src/texstream.h
+++ b/src/texstream.h
@@ -82,7 +82,7 @@ public:
 	explicit otexstream(odocstream & os)
 		: otexrowstream(os), canbreakline_(false),
 		  protectspace_(false), terminate_command_(false),
-		  parbreak_(true), lastchar_(0) {}
+		  parbreak_(true), blankline_(true), lastchar_(0) {}
 	///
 	void put(char_type const & c);
 	///
@@ -103,6 +103,7 @@ public:
 	void lastChar(char_type const & c)
 	{
 		parbreak_ = (!canbreakline_ && c == '\n');
+		blankline_ = ((!canbreakline_ && c == ' ') || c == '\n');
 		canbreakline_ = (c != '\n');
 		lastchar_ = c;
 	}
@@ -110,6 +111,8 @@ public:
 	char_type lastChar() const { return lastchar_; }
 	///
 	bool afterParbreak() const { return parbreak_; }
+	///
+	bool blankLine() const { return blankline_; }
 private:
 	///
 	bool canbreakline_;
@@ -120,6 +123,8 @@ private:
 	///
 	bool parbreak_;
 	///
+	bool blankline_;
+	///
 	char_type lastchar_;
 };