When the window loses focus io.KeysDown should be set to false

[TheClockIT]

Version: 1.83 WIP
Branch: 1.83 WIP_docking_

Back-ends: imgui_impl_win32.cpp
Operating System: Windows10 20H2

IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
...
    case WM_KILLFOCUS:
        memset(io.KeysDown, 0, sizeof(io.KeysDown));
        return 0;
...
}

[ocornut]

Same as #2062

[ocornut]

I'll move to #2062

[ocornut]

I pushed your suggested fix now : 1491d2c

As it happens, in docking + multi-viewports enabled it does make held key flick off for one frame, but this issue has also been present in the GLFW backend so my conclusion is that it's a much less problematic issue than the one we are fixing one. We can improve on the multi-viewports code later.