From a4ee55bc416d5afdd9538f951c27e2df2379a76c Mon Sep 17 00:00:00 2001
From: Tavmjong Bah <tavmjong@free.fr>
Date: Fri, 15 Nov 2019 14:08:04 +0100
Subject: Add unlinking function to CRStyleSheet.

---
 src/3rdparty/libcroco/cr-stylesheet.c | 43 +++++++++++++++++++++++++++++++++++
 src/3rdparty/libcroco/cr-stylesheet.h |  7 ++++++
 2 files changed, 50 insertions(+)

diff --git a/src/3rdparty/libcroco/cr-stylesheet.c b/src/3rdparty/libcroco/cr-stylesheet.c
index c80c40b93..3f554b18c 100644
--- a/src/3rdparty/libcroco/cr-stylesheet.c
+++ b/src/3rdparty/libcroco/cr-stylesheet.c
@@ -180,6 +180,7 @@ cr_stylesheet_append_stylesheet (CRStyleSheet * a_this, CRStyleSheet * a_new_sty
         for (cur = a_this; cur->next; cur = cur->next) ;
 
         cur->next = a_new_stylesheet;
+        a_new_stylesheet->prev = cur;
 
         /* The "origin" must apriori be the same for all stylesheets
            in a list. We must set it correctly or errors will occur in
@@ -190,6 +191,48 @@ cr_stylesheet_append_stylesheet (CRStyleSheet * a_this, CRStyleSheet * a_new_sty
         return a_this;
 }
 
+/**
+ * cr_stylesheet_unlink:
+ *@a_this: the stylesheet to unlink.
+ *
+ *Unlinks the stylesheet from the stylesheet list.
+ *
+ *Returns a pointer to the unlinked stylesheet in
+ *case of a successfull completion, NULL otherwise.
+ */
+CRStyleSheet *
+cr_stylesheet_unlink (CRStyleSheet * a_this)
+{
+        CRStyleSheet *result = a_this;
+
+        g_return_val_if_fail (result, NULL);
+
+        /*
+         *some sanity checks first
+         */
+        if (a_this->prev) {
+                g_return_val_if_fail (a_this->prev->next == a_this, NULL);
+
+        }
+        if (a_this->next) {
+                g_return_val_if_fail (a_this->next->prev == a_this, NULL);
+        }
+
+        /*
+         *now, the real unlinking job.
+         */
+        if (a_this->prev) {
+                a_this->prev->next = a_this->next;
+        }
+        if (a_this->next) {
+                a_this->next->prev = a_this->prev;
+        }
+
+        a_this->next = NULL;
+        a_this->prev = NULL;
+
+        return a_this;
+}
 
 /**
  *Appends a new import stylesheet to the current list of imports.
diff --git a/src/3rdparty/libcroco/cr-stylesheet.h b/src/3rdparty/libcroco/cr-stylesheet.h
index 7ebaf7a60..d6e720d90 100644
--- a/src/3rdparty/libcroco/cr-stylesheet.h
+++ b/src/3rdparty/libcroco/cr-stylesheet.h
@@ -91,6 +91,11 @@ struct _CRStyleSheet
          * A link to the next stylesheet.
          */
         CRStyleSheet *next;
+
+        /**
+         * A link to the previous stylesheet.
+         */
+        CRStyleSheet *prev;
 } ;
 
 CRStyleSheet * cr_stylesheet_new (CRStatement *a_stmts) ;
@@ -107,6 +112,8 @@ CRStyleSheet * cr_stylesheet_append_import (CRStyleSheet *a_this, CRStyleSheet *
 
 CRStyleSheet * cr_stylesheet_append_stylesheet (CRStyleSheet *a_this, CRStyleSheet *a_new_stylesheet) ;
 
+CRStyleSheet * cr_stylesheet_unlink (CRStyleSheet *a_this) ;
+
 void cr_stylesheet_ref (CRStyleSheet *a_this) ;
 
 gboolean cr_stylesheet_unref (CRStyleSheet *a_this) ;
-- 
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