Clipboard actions interference [Host:Debian 9 Stretch RC03][Guests: Win7Ultimate, Debian 8.8 Jessie]

[al64128]

VirtualBox Graphical User Interface VirtualBox version 5.1.22 r115126 (Qt5.7.1)

Prerequisites:

(P0) HOST: NVIDIA, Wacom drivers, 3 monitors total, Xorg under xfce4, Clipman for clipboard monitoring (Debian 9 Stretch RC03) (P1) Each guest has installed the corresponding "Guest Additions"; (P2) Each guest has bidirectional clipboard sharing enabled; (P3) Windows 7 Ultimate guest has the "seamless mode" enabled (thanks guys, this is awesome) (P4) After launching Win 7 Ultimate guest, xfce4-screenshooter can no longer catch screenshots and move it to clipboard; the copy-paste operations are still nominal; (P5) With both Win 7 Ultimate and Debian 8.8 Jessie guests clipboard operations within the HOST (within the guests this phenomena has not been confirmed) are being interfered the following way:

(01) Any and every mouse/Wacom Pen selection renders as copying to clipboard, before even the Ctrl+C is pressed; that means any selection automatically puts the selected text into the Host's clipboard, from within any and every application of the Host (Chrome, Chromium, Opera, Libre Office Calc, Libre Office Writer, Notes, Thunar, Terminal, and whatnot)

(02) After reboot both xfce4-screenshooter and clipboard operations work fine PRIOR to launching the VirtualBox

[al64128]

UPDATE: only xfce4-screenshooter works nominally after rebooting, without VirtualBox being launched;

the clipboard interference is still there - any and every selected text is being automatically copied to clipboard;

Clipman does not have these copied elements in the history list.

[al64128]

UPDATE: as mentioned in the discussion below, the interference caused by yhe clipman's settings which is "Sync selections".

​https://unix.stackexchange.com/questions/213840/how-to-toggle-or-turn-off-text-selection-being-sent-to-the-clipboard

Please mark this ticket as closed, as it has nothing too do with the VirtualBox and Clipman misbehavior has occurred simultaneously with the VirtualBox installation.

Thank you for paying attention.