Local-to-client paste from Qt GUI

[sjmf]

Supporting pasting from local machine to client would be a great addition.

Currently, while some command-line keyboard implementations support paste (Curses, TTY), there's no support in the GUI for this.

This could be supported through a menu option (Edit -> Paste), the implementation of which should take the contents of the clipboard (using QClipboard) and transmit them char-wise to the client machine with a suitable per-character delay (10ms?).

This functionality can target v1.5.2.

[sjmf]

Retrieving text from the clipboard in PyQt5:

Refs:
https://doc.qt.io/archives/qt-5.15/qclipboard.html
https://doc.qt.io/archives/qt-5.15/qmimedata.html
https://stackoverflow.com/questions/39967630/pyqt5-access-to-qclipboard-or-app-object-from-inside-a-widget

Untested:

# assuming self is already a QApplication instance...
#clipboard = self.clipboard()

# Actually, scratch that, it seems to be static:
from PyQt5.QtGui import QApplication, QClipboard
clipboard = QApplication.clipboard()
text = clipboard.text()

It's possible to check available data formats using mimeData():

mime_data = clipboard.mimeData()

if mime_data.hasText():
    print("Text:", mime_data.text())
elif mime_data.hasImage():
    image = clipboard.image()
    print("Clipboard contains an image.")
elif mime_data.hasUrls():
    urls = mime_data.urls()
    print("Clipboard URLs:", [url.toString() for url in urls])
else:
    print("Clipboard contains other data.")