linux support **Automatically copy selection** and **Right Click -> Paste text** from **Clipboard selection**

[X is for the X Selection: Copy and Paste on Linux](https://shallowsky.com/blog/linux/x-selection.html)
Linux have two types of selection, Primary and Clipboard.

now, WindTerm linux version support:
**Automatically copy selection** to **Primary selection**
**Right Click -> Paste text** from **Primary selection**

want, WindTerm linux version support:
**Automatically copy selection** to **Clipboard selection**
**Right Click -> Paste text** from **Clipboard selection**

when I remotely control Windows through remmina, copyed context in Windows can be pasted in WindTerm by right clicking and seclected text in WindTerm can be pasted in Windows by Ctrl + V. remmina sync Linux Clipboard selection with Windows Clipboard.

Start by tracing the Linux terminal's selection handling and the right-click paste entry point. Compare the existing Primary selection behavior with the requested Clipboard selection behavior, then verify that selection copying and right-click pasting integrate with the system clipboard as described.

Written by the indexing model from the issue text.