paste-no-restore.py

import aqt.editor

from aqt.qt import *

def _flagAnkiText(self):
    clip = self.editor.mw.app.clipboard()
    mime = clip.mimeData()
    if not mime.hasHtml():
        return
    html = mime.html()
    if '<img' in html:
        mime.setHtml("<!--anki-->" + mime.html())

def updateClipboard(self, mime, mode=QClipboard.Clipboard, restore=False):
    clip = self.editor.mw.app.clipboard()
    if mime.hasHtml() and self.savedClip.hasHtml():
        if mime.html() == self.savedClip.html():
            return
    elif mime.hasText() and self.savedClip.hasText():
       if mime.text().strip() == self.savedClip.text().strip():
            return    
    if restore:
        clip.setMimeData(self.savedClip, mode=mode)
    else:
        clip.setMimeData(mime, mode=mode)

def onPaste(self):
    mime = self.mungeClip()
    self.triggerPageAction(QWebPage.Paste)
    self.restoreClip(mime)

def mungeClip(self, mode=QClipboard.Clipboard):
    clip = self.editor.mw.app.clipboard()
    mime = clip.mimeData(mode=mode)
    self.saveClip(mode=mode)
    mime = self._processMime(mime)
    self.updateClipboard(mime, mode=mode)
    return mime

def restoreClip(self, mime, mode=QClipboard.Clipboard):
    self.updateClipboard(mime, mode=mode, restore=True)

aqt.editor.EditorWebView.updateClipboard = updateClipboard
aqt.editor.EditorWebView.onPaste = onPaste
aqt.editor.EditorWebView.mungeClip = mungeClip
aqt.editor.EditorWebView.restoreClip = restoreClip
aqt.editor.EditorWebView._flagAnkiText = _flagAnkiText