Global Clipboard strange behavior

[unman]

How to file a helpful issue

Qubes OS release

4.2

Brief summary

Data pasted from dom0 via global clipboard is retained.

Steps to reproduce

1. Copy data in dom0
2. Use qui-clipboard tool to Copy dom0 clipboard
3. In qube A, Ctrl+Shift+V, Ctrl+V
4. In qube B,select data, Ctrl+C, Ctrl+Shift+C
5. In qube A, Ctrl+Shift+V, Ctrl+V

Expected behavior

Data from qube B will be pasted in qube A

Actual behavior

Data from dom0 is pasted at step 3 AND step 5

At step 5 the usual message from qui-clipboard is shown, but the data is not availble for pasting.

[marmarek]

In qube B,select data, Ctrl+C, Ctrl+Shift+C

do you get the usual notification at this stage?

[UndeadDevel]

Cannot reproduce on my machine (Q4.2.1 NV41), but I'm using Super+C and Super+V as the Qubes Global clipboard shortcuts...wasn't there some other issue tied only to specific Global Clipboard shortcuts?

[apparatius]

I can replicate this issue if I add this policy:

qubes.ClipboardPaste	*	B	@anyvm	deny

I guess there is an issue with notification when you have notification of copied data to global clipboard even if no data was copied due to policy restriction.