Use ImDrawList::_SetTextureID(), making our shared g.FontStack[] authorative against window-local ImDrawList. - Whereas ImDrawList::PushTextureID()/PopTextureID() is not to be used across Begin() calls. - Note that we don't propagate current texture id when e.g. Begin()-ing into a new window, we never really did... - Some code paths never really fully worked with multiple atlas textures. - The rig
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