Method InputTextDeactivateHook

imgui_tiny_app/imgui/imgui_widgets.cpp:4565–4583

As InputText() retain textual data and we currently provide a path for user to not retain it (via local variables) we need some form of hook to reapply data back to user buffer on deactivation frame. (#4714) It would be more desirable that we discourage users from taking advantage of the "user not retaining data" trick, but that more likely be attractive when we do have _NoLiveEdit flag available.

// It would be more desirable that we discourage users from taking advantage of the "user not retaining data" trick,
// but that more likely be attractive when we do have _NoLiveEdit flag available.
void ImGui::InputTextDeactivateHook(ImGuiID id)
{
    ImGuiContext& g = *GImGui;
    ImGuiInputTextState* state = &g.InputTextState;
    if (id == 0 || state->ID != id)
        return;
    g.InputTextDeactivatedState.ID = state->ID;
    if (state->Flags & ImGuiInputTextFlags_ReadOnly)
    {
        g.InputTextDeactivatedState.TextA.resize(0); // In theory this data won't be used, but clear to be neat.
    }
    else
    {
        IM_ASSERT(state->TextA.Data != 0);
        IM_ASSERT(state->TextA[state->TextLen] == 0);
        g.InputTextDeactivatedState.TextA.resize(state->TextLen + 1);
        memcpy(g.InputTextDeactivatedState.TextA.Data, state->TextA.Data, state->TextLen + 1);
    }
}

static int* ImLowerBound(int* in_begin, int* in_end, int v)
{