Use LTR environment for forceLTR content with polyglossia

Fixes: #10548
(cherry picked from commit 10c06f67c9)

src/Paragraph.cpp

@@ -1090,13 +1090,17 @@ void Paragraph::Private::latexInset(BufferParams const & bparams,
 	odocstream::pos_type const len = os.os().tellp();
 
 	if (inset->forceLTR()
-	    && !runparams.use_polyglossia
 	    && running_font.isRightToLeft()
 	    // ERT is an exception, it should be output with no
 	    // decorations at all
 	    && inset->lyxCode() != ERT_CODE) {
-		if (running_font.language()->lang() == "farsi")
-			os << "\\beginL" << termcmd;
+		if (runparams.use_polyglossia) {
+			if (style.isCommand())
+				os << "\\LR{";
+			os << "\\begin{LTR}";
+		} else if (running_font.language()->lang() == "farsi"
+			   || running_font.language()->lang() == "arabic_arabi")
+			os << "\\textLR{" << termcmd;
 		else
 			os << "\\L{";
 		close = true;
@@ -1153,10 +1157,10 @@ void Paragraph::Private::latexInset(BufferParams const & bparams,
 	}
 
 	if (close) {
-		if (running_font.language()->lang() == "farsi")
-				os << "\\endL" << termcmd;
-			else
-				os << '}';
+		if (runparams.use_polyglossia && !style.isCommand())
+			os << "\\end{LTR}";
+		else
+			os << '}';
 	}
 
 	if (os.texrow().rows() > previous_row_count) {

status.23x

@@ -101,6 +101,9 @@ What's new
 - Fix text direction problem with polyglossia with nested languages
   (part of bug 10111).
 
+- Use LTR environment for forceLTR content in RTL context with
+  polyglossia (bug 10548).
+
 - Fix output of key symbols with info inset on the Mac (bug 10641).
 
 - Fix output of table cells with multiple languages (bug 11128).