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@@ -3782,6 +3782,13 @@ void ImGui::NewFrame()
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if (g.IO.ConfigWindowsResizeFromEdges && !(g.IO.BackendFlags & ImGuiBackendFlags_HasMouseCursors))
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g.IO.ConfigWindowsResizeFromEdges = false;
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+ // Perform simple check: error if Docking or Viewport are enabled _exactly_ on frame 1 (instead of frame 0 or later), which is a common error leading to loss of .ini data.
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+ const ImGuiColumnsFlags prev_config_flags = g.ConfigFlagsForFrame;
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+ if (g.FrameCount == 1 && (g.IO.ConfigFlags & ImGuiConfigFlags_DockingEnable) && (prev_config_flags & ImGuiConfigFlags_DockingEnable) == 0)
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+ IM_ASSERT(0 && "Please DockingEnable before the first call to NewFrame()! Otherwise you will lose your .ini settings!");
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+ if (g.FrameCount == 1 && (g.IO.ConfigFlags & ImGuiConfigFlags_ViewportsEnable) && (prev_config_flags & ImGuiConfigFlags_ViewportsEnable) == 0)
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+ IM_ASSERT(0 && "Please ViewportEnable before the first call to NewFrame()! Otherwise you will lose your .ini settings!");
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+
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// Perform simple checks: multi-viewport and platform windows support
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if (g.IO.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
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{
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