Clear local layout before reading BufferParams. Otherwise, you can't

delete the local layout.

src/Buffer.cpp

@@ -786,6 +786,7 @@ int Buffer::readHeader(Lexer & lex)
 	params().html_latex_end.clear();
 	params().html_math_img_scale = 1.0;
 	params().output_sync_macro.erase();
+	params().local_layout.clear();
 
 	for (int i = 0; i < 4; ++i) {
 		params().user_defined_bullet(i) = ITEMIZE_DEFAULTS[i];

status.20x

@@ -118,6 +118,8 @@ What's new
 - Changes to BibTeX files not noticed when new BibTeX inset created
   (bug 8107).
 
+- Made it possible to delete local layout in Document>Settings.
+
 
 * DOCUMENTATION AND LOCALIZATION