/usr/share/pixmaps/texmaker.png is in texmaker-data 4.3-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/pixmaps/../icons/hicolor/32x32/apps/texmaker.png
/usr/share/pixmaps/../icons/hicolor/32x32/apps/texmaker.png