nn ds

With some help from the information here (https://docs.microsoft.com/en-us/windows/win32/inputdev/wm-xbuttondown) I able to get two additional buttons working (for a total of 7) on my mouse: X button 1&2 / the thumb buttons.

Viewer: pasting text adds extra null character (^@) at the end

Viewer: black bars or scroll bar around windows with odd resolutions