Behavior of input method -- crdt.el

[Qiantan Hong <qhong@mit.edu>]

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Hi,

I’m now working on the compatibility between 
https://code.librehq.com/qhong/crdt.el <https://code.librehq.com/qhong/crdt.el> and Emacs input methods.
There might be the case that one peer is in the halfway of input
some characters using input method (it seems that at this state,
there are some temporary text inserted in the buffer without calling
*-change-functions), and some changes from other peer arrives.

After resolving the position of the changes, crdt.el move point
to the resolved position and use INSERT to insert the characters
from remote peer.
In the case that these other changes happen to at exactly the same
position that current user is inserting using input method, seems that
the input method get confused and consider those inserted character
as part of its halfway input. It doesn’t affect character selection, but
when user finally select a character, it erase both the halfway input
and the inserted remote characters. Now the peers are inconsistent.

Anyone have any idea on how to workaround this?

To be more clear, a concrete example:

User1 is typing using chinese-py.
User1’s buffer: ce
User2’s buffer: 

User2 type a “t” at the begining
User1’s buffer: tce
User2’s buffer: t

User1 finish selection
User1’s buffer: 测
User2’s buffer: t测
Notice that the input method also erase t.

Now both user’s buffers are inconsistent.


Best,
Qiantan


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