[LyX/master] Keep caret visible when small

[Jean-Marc Lasgouttes]

commit 4671214f3dbc95207eda7cafb37cd0064b11f3e8
Author: Daniel Ramoeller <d.lyx at web.de>
Date:   Fri Mar 12 19:19:51 2021 +0100

    Keep caret visible when small
    
    Fix for ticket #12190.
---
 src/BufferView.cpp |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/BufferView.cpp b/src/BufferView.cpp
index 79bf01f..f9bbe23 100644
--- a/src/BufferView.cpp
+++ b/src/BufferView.cpp
@@ -3159,7 +3159,7 @@ void BufferView::caretPosAndDim(Point & p, Dimension & dim) const
 	} else {
 		Font const font = cur.real_current_font;
 		frontend::FontMetrics const & fm = theFontMetrics(font);
-		dim.wid = fm.lineWidth();
+		dim.wid = max(fm.lineWidth(), 1);
 		dim.asc = fm.maxAscent();
 		dim.des = fm.maxDescent();
 	}