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	Viewports: made standalone modals appear in taskbar + new window perform z-check before merging in main host viewport. (#3511, #1542)
This should fix a good amount of "lost modal" problems, however it is still possible to loose a modal in a host viewport if secondary viewports are configured as children above the host.
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							@@ -6227,10 +6227,13 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
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            // Update common viewport flags
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            const ImGuiViewportFlags viewport_flags_to_clear = ImGuiViewportFlags_TopMost | ImGuiViewportFlags_NoTaskBarIcon | ImGuiViewportFlags_NoDecoration | ImGuiViewportFlags_NoRendererClear;
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            ImGuiViewportFlags viewport_flags = window->Viewport->Flags & ~viewport_flags_to_clear;
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            const bool is_short_lived_floating_window = (flags & (ImGuiWindowFlags_ChildMenu | ImGuiWindowFlags_Tooltip | ImGuiWindowFlags_Popup)) != 0;
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            const bool is_modal = (flags & ImGuiWindowFlags_Modal) != 0;
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            const bool is_short_lived_floating_window = (flags & (ImGuiWindowFlags_ChildMenu | ImGuiWindowFlags_Tooltip | ImGuiWindowFlags_Popup)) != 0 && !is_modal;
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            if (flags & ImGuiWindowFlags_Tooltip)
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                viewport_flags |= ImGuiViewportFlags_TopMost;
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            if (g.IO.ConfigViewportsNoTaskBarIcon || is_short_lived_floating_window)
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            //if (flags & ImGuiWindowFlags_Modal)
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            //    viewport_flags |= ImGuiViewportFlags_TopMost; // Not correct because other popups can be stack above a modal?
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            if ((g.IO.ConfigViewportsNoTaskBarIcon || is_short_lived_floating_window) && !is_modal)
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                viewport_flags |= ImGuiViewportFlags_NoTaskBarIcon;
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            if (g.IO.ConfigViewportsNoDecoration || is_short_lived_floating_window)
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                viewport_flags |= ImGuiViewportFlags_NoDecoration;
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@@ -6239,7 +6242,7 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
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            // won't steal the OS focus away from their parent window (which may be reflected in OS the title bar decoration).
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            // Setting _NoFocusOnClick would technically prevent us from bringing back to front in case they are being covered by an OS window from a different app,
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            // but it shouldn't be much of a problem considering those are already popups that are closed when clicking elsewhere.
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            if (is_short_lived_floating_window && (flags & ImGuiWindowFlags_Modal) == 0)
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            if (is_short_lived_floating_window && !is_modal)
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                viewport_flags |= ImGuiViewportFlags_NoFocusOnAppearing | ImGuiViewportFlags_NoFocusOnClick;
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            // We can overwrite viewport flags using ImGuiWindowClass (advanced users)
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@@ -11426,10 +11429,11 @@ static void ImGui::UpdateSelectWindowViewport(ImGuiWindow* window)
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            UpdateTryMergeWindowIntoHostViewports(window);
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    }
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    // Fallback to default viewport
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    // Fallback: merge in default viewport if z-order matches, otherwise create a new viewport
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    if (window->Viewport == NULL)
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        window->Viewport = main_viewport;
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        if (!UpdateTryMergeWindowIntoHostViewport(window, main_viewport))
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            window->Viewport = AddUpdateViewport(window, window->ID, window->Pos, window->Size, ImGuiViewportFlags_None);
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    // Mark window as allowed to protrude outside of its viewport and into the current monitor
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    if (!lock_viewport)
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    {
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							@@ -1609,7 +1609,7 @@ struct ImGuiIO
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    // Viewport options (when ImGuiConfigFlags_ViewportsEnable is set)
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    bool        ConfigViewportsNoAutoMerge;     // = false;         // Set to make all floating imgui windows always create their own viewport. Otherwise, they are merged into the main host viewports when overlapping it. May also set ImGuiViewportFlags_NoAutoMerge on individual viewport.
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    bool        ConfigViewportsNoTaskBarIcon;   // = false          // Disable default OS task bar icon flag for secondary viewports. When a viewport doesn't want a task bar icon, ImGuiViewportFlags_NoTaskBarIcon will be set on it.
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    bool        ConfigViewportsNoDecoration;    // = true           // [BETA] Disable default OS window decoration flag for secondary viewports. When a viewport doesn't want window decorations, ImGuiViewportFlags_NoDecoration will be set on it. Enabling decoration can create subsequent issues at OS levels (e.g. minimum window size).
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    bool        ConfigViewportsNoDecoration;    // = true           // Disable default OS window decoration flag for secondary viewports. When a viewport doesn't want window decorations, ImGuiViewportFlags_NoDecoration will be set on it. Enabling decoration can create subsequent issues at OS levels (e.g. minimum window size).
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    bool        ConfigViewportsNoDefaultParent; // = false          // Disable default OS parenting to main viewport for secondary viewports. By default, viewports are marked with ParentViewportId = <main_viewport>, expecting the platform backend to setup a parent/child relationship between the OS windows (some backend may ignore this). Set to true if you want the default to be 0, then all viewports will be top-level OS windows.
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    // Miscellaneous options
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