/usr/share/doc/libgtkglextmm-x11-1.2-doc/html/inherit__graph__2.map is in libgtkglextmm-x11-1.2-doc 1.2.0-7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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rect $classGdk_1_1GL_1_1Drawable.html 9,32 142,56
rect $classGdk_1_1GL_1_1Pixmap.html 194,8 317,32
rect $classGdk_1_1GL_1_1Window.html 193,56 318,80
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