From 7261fa94482916cb9bf2ba0d21c4df390ea58320 Mon Sep 17 00:00:00 2001
From: Jean-Marc Lasgouttes <lasgouttes@lyx.org>
Date: Tue, 26 Jul 2022 00:45:57 +0200
Subject: [PATCH] Revert "Reimplement support for numbering of equation
 previews"

This reverts commit f4da29306fc8acc0cca2ac6fe36f7dfcb58c2563.
---
 src/mathed/InsetMathHull.cpp | 39 +++++++++++++++++++++++++++++++-----
 src/mathed/InsetMathHull.h   |  4 ++++
 2 files changed, 38 insertions(+), 5 deletions(-)

diff --git a/src/mathed/InsetMathHull.cpp b/src/mathed/InsetMathHull.cpp
index 8ea552dd29..8ede260632 100644
--- a/src/mathed/InsetMathHull.cpp
+++ b/src/mathed/InsetMathHull.cpp
@@ -253,9 +253,20 @@ void InsetMathHull::updateBuffer(ParIterator const & it, UpdateType utype, bool
 		Counters & cnts =
 			buffer_->masterBuffer()->params().documentClass().counters();
 
+		// right now, we only need to do this at export time
+		if (utype == OutputUpdate) {
+			for (size_t i = 0; i < numcnts; ++i) {
+				docstring const cnt = from_ascii(counters_to_save[i]);
+				if (cnts.hasCounter(cnt))
+					counter_map[cnt] = cnts.value(cnt);
+			}
+		}
+
 		// this has to be done separately
 		docstring const eqstr = from_ascii("equation");
 		if (cnts.hasCounter(eqstr)) {
+			if (utype == OutputUpdate)
+				counter_map[eqstr] = cnts.value(eqstr);
 			for (size_t i = 0; i != label_.size(); ++i) {
 				if (numbered(i)) {
 					Paragraph const & par = it.paragraph();
@@ -826,7 +837,29 @@ void InsetMathHull::preparePreview(DocIterator const & pos,
 	if (lsize != "normalsize" && !prefixIs(lsize, "error"))
 		setfont += from_ascii("\\" + lsize + '\n');
 
-	docstring const snippet = macro_preamble + setfont + latexString(*this) + endfont;
+	docstring setcnt;
+	if (forexport && haveNumbers()) {
+		docstring eqstr = from_ascii("equation");
+		CounterMap::const_iterator it = counter_map.find(eqstr);
+		if (it != counter_map.end()) {
+			int num = it->second;
+			if (num >= 0)
+				setcnt += from_ascii("\\setcounter{") + eqstr + '}' +
+				          '{' + convert<docstring>(num) + '}' + '\n';
+		}
+		for (size_t i = 0; i != numcnts; ++i) {
+			docstring cnt = from_ascii(counters_to_save[i]);
+			it = counter_map.find(cnt);
+			if (it == counter_map.end())
+					continue;
+			int num = it->second;
+			if (num > 0)
+				setcnt += from_ascii("\\setcounter{") + cnt + '}' +
+				          '{' + convert<docstring>(num) + '}';
+		}
+	}
+	docstring const snippet = macro_preamble + setfont + setcnt
+	                          + latexString(*this) + endfont;
 	LYXERR(Debug::MACROS, "Preview snippet: " << snippet);
 	preview_->addPreview(snippet, *buffer, forexport);
 }
@@ -1663,10 +1696,6 @@ void InsetMathHull::eol(TeXMathStream & os, row_type row, bool fragile, bool lat
 			else if (numbered_[row]  == NOTAG)
 				os<< "\\notag ";
 		}
-		if (os.output() == TeXMathStream::wsPreview && !numbers_[row].empty()) {
-			os << "\\global\\def\\theequation{" << numbers_[row] << "}\n";
-		}
-
 	}
 	// Never add \\ on the last empty line of eqnarray and friends
 	last_eoln = false;
diff --git a/src/mathed/InsetMathHull.h b/src/mathed/InsetMathHull.h
index 92903c5e42..52e8177631 100644
--- a/src/mathed/InsetMathHull.h
+++ b/src/mathed/InsetMathHull.h
@@ -270,6 +270,10 @@ private:
 	unique_ptr<RenderPreview> preview_;
 	///
 	DocIterator docit_;
+	///
+	typedef std::map<docstring, int> CounterMap;
+	/// used to store current values of important counters
+	CounterMap counter_map;
 //
 // Incorporate me
 //
-- 
2.39.5