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Docking: Fix crash when a dock node gets re-qualified as dockspace>floating>dockspace.. (#3203, #4295)

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Which tends to happen when incorrectly calling DockBuilderAddNode() without ImGuiDockNodeFlags_Dockspace and using it as a Dockspace on the next frame after the floating window hosting the node has been automatically created.
This commit is contained in:
ocornut
2021-07-07 18:22:55 +02:00
parent cd4cc9ff0d
commit eb6f4b1a6a
2 changed files with 21 additions and 5 deletions
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21
imgui.cpp
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@ -13520,6 +13520,20 @@ static void ImGui::DockNodeUpdateForRootNode(ImGuiDockNode* node)
}
}
static void DockNodeSetupHostWindow(ImGuiDockNode* node, ImGuiWindow* host_window)
{
// Remove ourselves from any previous different host window
// This can happen if a user mistakenly does (see #4295 for details):
// - N+0: DockBuilderAddNode(id, 0) // missing ImGuiDockNodeFlags_DockSpace
// - N+1: NewFrame() // will create floating host window for that node
// - N+1: DockSpace(id) // requalify node as dockspace, moving host window
if (node->HostWindow && node->HostWindow != host_window && node->HostWindow->DockNodeAsHost == node)
node->HostWindow->DockNodeAsHost = NULL;
host_window->DockNodeAsHost = node;
node->HostWindow = host_window;
}
static void ImGui::DockNodeUpdate(ImGuiDockNode* node)
{
ImGuiContext& g = *GImGui;
@ -13668,8 +13682,8 @@ static void ImGui::DockNodeUpdate(ImGuiDockNode* node)
PopStyleVar();
beginned_into_host_window = true;
node->HostWindow = host_window = g.CurrentWindow;
host_window->DockNodeAsHost = node;
host_window = g.CurrentWindow;
DockNodeSetupHostWindow(node, host_window);
host_window->DC.CursorPos = host_window->Pos;
node->Pos = host_window->Pos;
node->Size = host_window->Size;
@ -14986,9 +15000,8 @@ ImGuiID ImGui::DockSpace(ImGuiID id, const ImVec2& size_arg, ImGuiDockNodeFlags
PopStyleVar();
ImGuiWindow* host_window = g.CurrentWindow;
host_window->DockNodeAsHost = node;
DockNodeSetupHostWindow(node, host_window);
host_window->ChildId = window->GetID(title);
node->HostWindow = host_window;
node->OnlyNodeWithWindows = NULL;
IM_ASSERT(node->IsRootNode());