Method TabBarScrollToTab

src/external/imgui/imgui_widgets.cpp:8281–8312

Note: we may scroll to tab that are not selected! e.g. using keyboard arrow keys

// Note: we may scroll to tab that are not selected! e.g. using keyboard arrow keys
static void ImGui::TabBarScrollToTab(ImGuiTabBar* tab_bar, ImGuiID tab_id, ImGuiTabBarSection* sections)
{
    ImGuiTabItem* tab = TabBarFindTabByID(tab_bar, tab_id);
    if (tab == NULL)
        return;
    if (tab->Flags & ImGuiTabItemFlags_SectionMask_)
        return;

    ImGuiContext& g = *GImGui;
    float margin = g.FontSize * 1.0f; // When to scroll to make Tab N+1 visible always make a bit of N visible to suggest more scrolling area (since we don't have a scrollbar)
    int order = TabBarGetTabOrder(tab_bar, tab);

    // Scrolling happens only in the central section (leading/trailing sections are not scrolling)
    float scrollable_width = TabBarCalcScrollableWidth(tab_bar, sections);

    // We make all tabs positions all relative Sections[0].Width to make code simpler
    float tab_x1 = tab->Offset - sections[0].Width + (order > sections[0].TabCount - 1 ? -margin : 0.0f);
    float tab_x2 = tab->Offset - sections[0].Width + tab->Width + (order + 1 < tab_bar->Tabs.Size - sections[2].TabCount ? margin : 1.0f);
    tab_bar->ScrollingTargetDistToVisibility = 0.0f;
    if (tab_bar->ScrollingTarget > tab_x1 || (tab_x2 - tab_x1 >= scrollable_width))
    {
        // Scroll to the left
        tab_bar->ScrollingTargetDistToVisibility = ImMax(tab_bar->ScrollingAnim - tab_x2, 0.0f);
        tab_bar->ScrollingTarget = tab_x1;
    }
    else if (tab_bar->ScrollingTarget < tab_x2 - scrollable_width)
    {
        // Scroll to the right
        tab_bar->ScrollingTargetDistToVisibility = ImMax((tab_x1 - scrollable_width) - tab_bar->ScrollingAnim, 0.0f);
        tab_bar->ScrollingTarget = tab_x2 - scrollable_width;
    }
}

void ImGui::TabBarQueueFocus(ImGuiTabBar* tab_bar, ImGuiTabItem* tab)
{