Automatically copy to the clipboard after selecting some words.

[txdyzdy]

Describe the bug
Automatically copy to the clipboard after selecting some words in the server.

To Reproduce
Steps to reproduce the behavior:

1. Click on 'clipboard'
2. Select somethings
3. See error

Expected behavior
After selecting the text in the server, click 'Copy' or the shortcut key ctrl + x/c, and then copy it to the clipboard.

If I want to replace some text on the server, after putting the local text into the clipboard, select the text to be replaced on the server, the content of the clipboard is changed.

Client (please complete the following information):

• OS: iOS
• Browser: chrome
• Browser version: 91.0.4472.114

Server (please complete the following information):

• noVNC version: 1.2.0
• VNC server: TigerVNC
• WebSocket proxy: websockify

[samhed]

That's because of how the primary clipboard works in Linux, selecting text will copy it to the clipboard. I understand your confusion in this case due to the way the clipboard works in noVNC. Using the clipboard in noVNC is quite cumbersome at the moment, hopefully we can get it working more seamlessly in the future, see #1347

I'd recommend looking for a way of disabling the primary clipboard on the linux desktop on your server.