From 68e94f0a2e27675451538a2eaf34d67728fe6a55 Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Sun, 18 Aug 2019 11:12:43 +0200
Subject: [PATCH] Inspector: Implement RemoteObjectGraphModel::parent_index()

This makes GTreeView paint the tree lines correctly. It's a bit weird
that this is needed, but straightforward to implement so meh.
---
 DevTools/Inspector/RemoteObjectGraphModel.cpp | 16 ++++++++++++++++
 DevTools/Inspector/RemoteObjectGraphModel.h   |  1 +
 2 files changed, 17 insertions(+)

diff --git a/DevTools/Inspector/RemoteObjectGraphModel.cpp b/DevTools/Inspector/RemoteObjectGraphModel.cpp
index 1647a9b11ad..2b0776aea99 100644
--- a/DevTools/Inspector/RemoteObjectGraphModel.cpp
+++ b/DevTools/Inspector/RemoteObjectGraphModel.cpp
@@ -26,6 +26,22 @@ GModelIndex RemoteObjectGraphModel::index(int row, int column, const GModelIndex
     return create_index(row, column, remote_parent.children.at(row));
 }
 
+GModelIndex RemoteObjectGraphModel::parent_index(const GModelIndex& index) const
+{
+    if (!index.is_valid())
+        return {};
+    auto& remote_object = *static_cast<RemoteObject*>(index.internal_data());
+    if (!remote_object.parent)
+        return {};
+    for (int row = 0; row < remote_object.parent->children.size(); ++row) {
+        if (remote_object.parent->children[row] == &remote_object)
+            return create_index(row, 0, remote_object.parent);
+    }
+
+    ASSERT_NOT_REACHED();
+    return {};
+}
+
 int RemoteObjectGraphModel::row_count(const GModelIndex& index) const
 {
     if (!index.is_valid())
diff --git a/DevTools/Inspector/RemoteObjectGraphModel.h b/DevTools/Inspector/RemoteObjectGraphModel.h
index 7aa239b19e4..e6e50b1644f 100644
--- a/DevTools/Inspector/RemoteObjectGraphModel.h
+++ b/DevTools/Inspector/RemoteObjectGraphModel.h
@@ -18,6 +18,7 @@ public:
     virtual int column_count(const GModelIndex& = GModelIndex()) const override;
     virtual GVariant data(const GModelIndex&, Role = Role::Display) const override;
     virtual GModelIndex index(int row, int column, const GModelIndex& parent = GModelIndex()) const override;
+    virtual GModelIndex parent_index(const GModelIndex&) const;
     virtual void update() override;
 
 private: