[LyX/master] Do not toggle on (all) layouts in force plain

[Jean-Marc Lasgouttes]

commit 5d269df60674df4b8f5f56cdf4e16c88f23df32b
Author: Daniel Ramoeller <d.lyx at web.de>
Date:   Sat Mar 6 11:50:11 2021 +0100

    Do not toggle on (all) layouts in force plain
    
    Fix for #12179.
---
 src/Text3.cpp |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/Text3.cpp b/src/Text3.cpp
index 5c623fe..5e9f6cf 100644
--- a/src/Text3.cpp
+++ b/src/Text3.cpp
@@ -3519,7 +3519,7 @@ bool Text::getStatus(Cursor & cur, FuncRequest const & cmd,
 		docstring const layout = resolveLayout(req_layout, cur);
 
 		enable = !owner_->forcePlainLayout() && !layout.empty();
-		status.setOnOff(isAlreadyLayout(layout, cur));
+		status.setOnOff(!owner_->forcePlainLayout() && isAlreadyLayout(layout, cur));
 		break;
 	}