addons/imguipanelmanager/imguipanelmanager.cpp: Changed stuff related to INT_MAX to match changes in the ImGui upstream repository.
addons/imguipanelmanager/imguipanelmanager.cpp: Changed stuff related to INT_MAX to match changes in the ImGui upstream repository.

Flix01/imgui,tom-seddon/imgui,wflohry/imgui-addons,wflohry/imgui-addons,Flix01/imgui,tom-seddon/imgui,Flix01/imgui