# Buggy code
def getLeoOutlineFromClipboard(self, s, reassignIndices=True):
    """Read a Leo outline from string s in clipboard format."""
    c = self.c
    current = c.p
    if not current:
        g.trace("no c.p")
        return None
    check = not reassignIndices
    self.initReadIvars()
    # Save the hidden root's children.
    children = c.hiddenRootNode.children
    #
    # Save and clear gnxDict.
    # This ensures that new indices will be used for all nodes.
    if reassignIndices:
        oldGnxDict = self.gnxDict
        self.gnxDict = {}
    else:
        # All pasted nodes should already have unique gnx's.
        ni = g.app.nodeIndices
        for v in c.all_unique_nodes():
            ni.check_gnx(c, v.fileIndex, v)
    self.usingClipboard = True
    try:
        # This encoding must match the encoding used in putLeoOutline.
        s = g.toEncodedString(s, self.leo_file_encoding, reportErrors=True)
        # readSaxFile modifies the hidden root.
        v = self.readSaxFile(
            theFile=None,
            fileName="<clipboard>",
            silent=True,  # don't tell about stylesheet elements.
            inClipboard=True,
            reassignIndices=reassignIndices,
            s=s,
        )
        if not v:
            return g.es("the clipboard is not valid ", color="blue")
    finally:
        self.usingClipboard = False
    # Restore the hidden root's children
    c.hiddenRootNode.children = children
    # Unlink v from the hidden root.
    v.parents.remove(c.hiddenRootNode)
    p = leoNodes.Position(v)
    #
    # Important: we must not adjust links when linking v
    # into the outline.  The read code has already done that.
    if current.hasChildren() and current.isExpanded():
        if check and not self.checkPaste(current, p):
            return None
        p._linkAsNthChild(current, 0, adjust=False)
    else:
        if check and not self.checkPaste(current.parent(), p):
            return None
        p._linkAfter(current, adjust=False)
    if reassignIndices:
        self.gnxDict = oldGnxDict
        ni = g.app.nodeIndices
        for p2 in p.self_and_subtree():
            v = p2.v
            index = ni.getNewIndex(v)
            if g.trace_gnxDict:
                g.trace(c.shortFileName(), "**restoring**", index, v)
    c.selectPosition(p)
    self.initReadIvars()
    return p


# Traceback (ValueError)
Traceback (most recent call last):

File "/pri/git/leo-editor/leo/core/leoCommands.py", line 2016, in executeAnyCommand
return command(event)

File "/pri/git/leo-editor/leo/core/leoGlobals.py", line 2445, in commander_command_wrapper
method(event=event)

File "/pri/git/leo-editor/leo/commands/commanderOutlineCommands.py", line 1390, in promote
p.promote()

File "/pri/git/leo-editor/leo/core/leoNodes.py", line 1596, in promote
child.parents.remove(p.v)

ValueError: list.remove(x): x not in list

# Fixed code
def getLeoOutlineFromClipboard(self, s, reassignIndices=True):
    """Read a Leo outline from string s in clipboard format."""
    c = self.c
    current = c.p
    if not current:
        g.trace("no c.p")
        return None
    check = not reassignIndices
    self.initReadIvars()
    # Save the hidden root's children.
    children = c.hiddenRootNode.children
    #
    # Save and clear gnxDict.
    # This ensures that new indices will be used for all nodes.
    if reassignIndices:
        oldGnxDict = self.gnxDict
        self.gnxDict = {}
    else:
        # All pasted nodes should already have unique gnx's.
        ni = g.app.nodeIndices
        for v in c.all_unique_nodes():
            ni.check_gnx(c, v.fileIndex, v)
    self.usingClipboard = True
    try:
        # This encoding must match the encoding used in putLeoOutline.
        s = g.toEncodedString(s, self.leo_file_encoding, reportErrors=True)
        # readSaxFile modifies the hidden root.
        v = self.readSaxFile(
            theFile=None,
            fileName="<clipboard>",
            silent=True,  # don't tell about stylesheet elements.
            inClipboard=True,
            reassignIndices=reassignIndices,
            s=s,
        )
        if not v:
            return g.es("the clipboard is not valid ", color="blue")
    finally:
        self.usingClipboard = False
    # Restore the hidden root's children
    c.hiddenRootNode.children = children
    # Unlink v from the hidden root.
    v.parents.remove(c.hiddenRootNode)
    p = leoNodes.Position(v)
    #
    # Important: we must not adjust links when linking v
    # into the outline.  The read code has already done that.
    if current.hasChildren() and current.isExpanded():
        if check and not self.checkPaste(current, p):
            return None
        p._linkAsNthChild(current, 0, adjust=False)
    else:
        if check and not self.checkPaste(current.parent(), p):
            return None
        p._linkAfter(current, adjust=False)
    if reassignIndices:
        self.gnxDict = oldGnxDict
        self.reassignAllIndices(p)
    else:
        # Fix #862: paste-retaining-clones can corrupt the outline.
        self.linkChildrenToParents(p)
    c.selectPosition(p)
    self.initReadIvars()
    return p