[LyX/master] Add bug reference.

[Pavel Sanda]

commit 9d8bef017bbe4946ba0423d5b57a6bbeb21813d4
Author: Pavel Sanda <sanda at lyx.org>
Date:   Mon Jul 3 23:54:34 2023 +0200

    Add bug reference.
---
 src/frontends/qt/GuiWorkArea.cpp |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/frontends/qt/GuiWorkArea.cpp b/src/frontends/qt/GuiWorkArea.cpp
index 7433c28..3cd5f47 100644
--- a/src/frontends/qt/GuiWorkArea.cpp
+++ b/src/frontends/qt/GuiWorkArea.cpp
@@ -653,7 +653,7 @@ void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 			}
 		}
 		if (e->reason() == QContextMenuEvent::Keyboard)
-			// Subtract the top margin
+			// Subtract the top margin, see #12811
 			pos.setY(pos.y() - d->buffer_view_->topMargin());
 
 		name = d->buffer_view_->contextMenu(pos.x(), pos.y());