From f9e9735d5f09d94cfbedb5954da5e28baaf1d7b4 Mon Sep 17 00:00:00 2001
From: Le Tan <tamlokveer@gmail.com>
Date: Sun, 25 Nov 2018 11:19:41 +0800
Subject: [PATCH] Preview: fix glitchy PlantUML preview when no background is
 specified

---
 src/utils/vutils.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/utils/vutils.cpp b/src/utils/vutils.cpp
index 65cfeaba..bd71caac 100644
--- a/src/utils/vutils.cpp
+++ b/src/utils/vutils.cpp
@@ -1748,7 +1748,10 @@ QPixmap VUtils::svgToPixmap(const QByteArray &p_content,
     }
 
     QPixmap pm(deSz);
-    if (!p_background.isEmpty()) {
+    if (p_background.isEmpty()) {
+        // Fill a transparent background to avoid glitchy preview.
+        pm.fill(QColor(255, 255, 255, 0));
+    } else {
         pm.fill(p_background);
     }