re-implement clipboard without gtk or nested main

[Antoine Martin]

As it is, it is just too problematic: too many bugs to list, including some unresolved ones: #669, #452 (it is also causing hangs with #598).

We should be able to rip it out and just use plain X11 calls, hopefully GTK won't get too confused by this...

We can keep the existing code, at least client side, for the non-X11 platforms.

Link: ​x-cut-and-paste

[Antoine Martin]

Another reason for doing this, just hit this today (not sure how):

RuntimeError: maximum recursion depth exceeded
Traceback (most recent call last):
  File "/usr/lib64/python2.7/site-packages/xpra/clipboard/clipboard_base.py", line 167, in _get_clipboard_from_remote_handler
Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib64/python2.7/site-packages/xpra/gtk_common/quit.py", line 67, in gtk_main_quit_on_fatal_exception
    print(traceback.print_exception(etype, val, tb))
  File "/usr/lib64/python2.7/traceback.py", line 125, in print_exception
    print_tb(tb, limit, file)
  File "/usr/lib64/python2.7/traceback.py", line 69, in print_tb
    line = linecache.getline(filename, lineno, f.f_globals)
  File "/usr/lib64/python2.7/linecache.py", line 14, in getline
    lines = getlines(filename, module_globals)
  File "/usr/lib64/python2.7/linecache.py", line 40, in getlines
    return updatecache(filename, module_globals)
RuntimeError: maximum recursion depth exceeded

Original exception was:
Traceback (most recent call last):
  File "/usr/lib64/python2.7/site-packages/xpra/clipboard/clipboard_base.py", line 167, in _get_clipboard_from_remote_handler
    log("get clipboard from remote handler id=%s", request_id)
RuntimeError: maximum recursion depth exceeded

[Antoine Martin]

API links:

• ​win32 Clipboard
• ​OSX NSPasteboard Class

[Antoine Martin]

Re-scheduling due to lack of time.

Another item worth considering during the re-write would be to make all clipboards "greedy" like the win32 and osx ones, or at least having the option of doing that.

#1018 is a duplicate of this ticket.

[Antoine Martin]

Likely to be quite hard.

[Antoine Martin]

See also: #1589 GTK3 clipboard support