Meld source view is not repainting properly, causing broken UI

[Krishnaswami Iyer <r k iyer 2001 gmail com>]

Hello,

      Using Meld to compare two simple files (two lines of "Abcd") leads to this UI - https://imgur.com/a/wyKFh. This is on an updated Lubuntu 17.04 (kernel 4.10.0-20, gcc v6.3.0 64bit). It can be reproduced with the latest meld from git trunk.

       It seems that the sourceview control is not repainting portions of the UI leading to the previous window contents showing up there.

       Any suggestions on how I can debug this? I am able to see what seem like refresh events firing in filediff.py (am not familiar with gtk) and on focus events fire correctly. Is it simply an issue with gtksourceview? I am happy to supply any additional data/screenshots etc.

Thanks,

RK

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