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Multi-viewports and window z-order issues. #2871

@cliffowen

Description

@cliffowen

Version: 1.74
Branch: Docking

Back-ends: DirectX 11
Compiler: Visual Studio 2017, 141 toolchain
Operating System: Windows 10

There's appears to be some issues with depth sorting with the examples, specifically

example_win32_directx11.

Create a background dockspace, and I happened to maximize that window. Open up a couple other examples so you have windows to work with. It doesn't matter which windows.

Clipping the widget
imgui_dockIssue1

Depth ordering
imgui_dockIssue2

Thankfully, DX10 and DX12 as well as OpenGL 2 and 3 do not exhibit these issues so I'm hopeful it isn't a imgui issue but maybe more of a render pipeline issue. I also suspect the two issues are the same which is why they are both shown here.

SMCVE... it's just the example. No additional code..

Priority for me: Low. This is just for tracking and a someday fix.

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