The reason is in kernel TASK_COMM_LEN (check man proc) constant fixed to
16 (name + \0). A guy called [Luben Tuikov][0] proposed to increase this
back on 2006 ([last lines][1] of sys.c). Even if this is too difficult
because of mysterous complicated reasons pgrep should search on the
complete name,
Confirmed on latest Xenial for top, `ps -e` and pgrep:
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:Ubuntu Xenial Xerus (development branch)
Release:16.04
Codename: xenial
$ python3 -c 'print(len("chromium-browser"))'
16
$ pgrep chromium-bro
2 matches
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