From d06747abca1e9e652a764db9747395d14f7f6f98 Mon Sep 17 00:00:00 2001
From: Bogdan Chadkin <trysound@yandex.ru>
Date: Thu, 25 Feb 2021 00:05:26 +0300
Subject: [PATCH] Keep hidden elements if any descendant enables visibility

---
 plugins/removeHiddenElems.js          |  4 +++-
 test/plugins/removeHiddenElems.12.svg | 20 ++++++++++++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)
 create mode 100644 test/plugins/removeHiddenElems.12.svg

diff --git a/plugins/removeHiddenElems.js b/plugins/removeHiddenElems.js
index dba7a3d15..80d4b601f 100644
--- a/plugins/removeHiddenElems.js
+++ b/plugins/removeHiddenElems.js
@@ -52,7 +52,9 @@ exports.fn = function (item, params) {
         // https://www.w3schools.com/cssref/pr_class_visibility.asp
         if (
             params.isHidden &&
-            item.hasAttr('visibility', 'hidden')
+            item.hasAttr('visibility', 'hidden') &&
+            // keep if any descendant enables visibility
+            item.querySelector('[visibility=visible]') == null
         ) return false;
 
         // display="none"
diff --git a/test/plugins/removeHiddenElems.12.svg b/test/plugins/removeHiddenElems.12.svg
new file mode 100644
index 000000000..dee42820f
--- /dev/null
+++ b/test/plugins/removeHiddenElems.12.svg
@@ -0,0 +1,20 @@
+<svg width="480" height="360" xmlns="http://www.w3.org/2000/svg">
+  <rect x="96" y="96" width="96" height="96" fill="lime" />
+  <g visibility="hidden">
+    <rect x="96" y="96" width="96" height="96" fill="red" />
+  </g>
+  <rect x="196.5" y="196.5" width="95" height="95" fill="red"/>
+  <g visibility="hidden">
+    <rect x="196" y="196" width="96" height="96" fill="lime" visibility="visible" />
+  </g>
+</svg>
+
+@@@
+
+<svg width="480" height="360" xmlns="http://www.w3.org/2000/svg">
+    <rect x="96" y="96" width="96" height="96" fill="lime"/>
+    <rect x="196.5" y="196.5" width="95" height="95" fill="red"/>
+    <g visibility="hidden">
+        <rect x="196" y="196" width="96" height="96" fill="lime" visibility="visible"/>
+    </g>
+</svg>