[LyX/master] Let's use "xhtml" as in the sources

[Juergen Spitzmueller]

commit c187cb7a1eb41ce72947c1e88fe4d71b7efafbcf
Author: Juergen Spitzmueller <spitz at lyx.org>
Date:   Fri Aug 14 09:03:49 2026 +0200

    Let's use "xhtml" as in the sources
---
 src/BufferView.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/BufferView.cpp b/src/BufferView.cpp
index ed1ace664d..30fd367a53 100644
--- a/src/BufferView.cpp
+++ b/src/BufferView.cpp
@@ -1423,7 +1423,7 @@ bool BufferView::getStatus(FuncRequest const & cmd, FuncStatus & flag)
 	case LFUN_COPY: {
 		string const arg = cmd.getArg(0);
 		if (!arg.empty() && arg != "latex" && arg != "plain"
-		     && arg != "html" && arg != "docbook") {
+		     && arg != "xhtml" && arg != "docbook") {
 			flag.setEnabled(false);
 			break;
 		}
@@ -2689,7 +2689,7 @@ void BufferView::dispatch(FuncRequest const & cmd, DispatchResult & dr)
 		int option = AS_STR_NONE;
 		if (type == "latex")
 			option = AS_STR_LATEX;
-		else if (type == "html")
+		else if (type == "xhtml")
 			option = AS_STR_XHTML;
 		else if (type == "docbook")
 			option = AS_STR_DOCBOOK;