[LyX/master] Addendum to #ed8a7b8

commit 49be8de1b9d184d653161e172804fc9ed84348ac
Author: Koji Yokota <[email protected]>
Date:   Fri Jul 24 15:01:56 2026 +0900

    Addendum to #ed8a7b8
---
 src/graphics/PreviewLoader.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/graphics/PreviewLoader.cpp b/src/graphics/PreviewLoader.cpp
index 0d185b4350..5156922494 100644
--- a/src/graphics/PreviewLoader.cpp
+++ b/src/graphics/PreviewLoader.cpp
@@ -679,9 +679,12 @@ void PreviewLoader::Impl::startLoading(bool wait)
 	// The colors should be customizable.
 	if (!buffer_.isExporting()) {
 		ColorCode const fg = PreviewLoader::foregroundColor();
+		cs << " --fg " << theApp()->hexName(fg);
 		ColorCode const bg = PreviewLoader::backgroundColor();
-		cs << " --fg " << theApp()->hexName(fg)
-		   << " --bg " << theApp()->hexName(bg);
+		if (bg == Color_transparent)
+			cs << " --bg \"transparent\"";
+		else
+			cs << " --bg " << theApp()->hexName(bg);
 	}
 
 	cs << latexparam;
-- 
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