e0224c6440
Each pybind extension module holds its own copy of the ImGui/ImPlot globals (extension modules are loaded RTLD_LOCAL), so the viewer that owns the contexts must share the pointers explicitly. Without this, client plotting GUIs and user plotting scripts (e.g. the implot sample) crash on null context pointers. PiperOrigin-RevId: 951917287 Change-Id: I639a173c2ae9f1af4feaf57aff7b5c81854b7393