Same issue also confirmed on Ubuntu 16.04 LTS and 16.10.
The cleaner workaround I've achieved is to create a custom desktop entry with different file and app name (Name=Dia-X or whatever) on your "~/.local/share/applications/", adding "Exec=env LIBOVERLAY_SCROLLBAR=0 dia %F"
as mobidyc pointed.
Same issue also confirmed on Ubuntu 16.04 LTS and 16.10.
The cleaner workaround I've achieved is to create a custom desktop entry with different file and app name (Name=Dia-X or whatever) on your "~/.local/ share/applicati ons/", adding "Exec=env LIBOVERLAY_ SCROLLBAR= 0 dia %F"
as mobidyc pointed.