Bram,
I recently stumbled over an ml_get: invalid lnum error in my NrrwRgn 
plugin (when writing changes back). I have not been able to reproduce 
the issue without the plugin.

What it does however is, it switches to a different buffer in the same 
window, moves to a certain position and replaces part or the buffer and 
switches back to the original buffer. The problem is, that when 
restoring the buffer and windows in aucmd_restbuf() the cursor position 
is not validated.

This patch fixes the issue:

diff --git a/src/fileio.c b/src/fileio.c
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -9009,6 +9009,7 @@ win_found:

            curwin = aco->save_curwin;
            curbuf = curwin->w_buffer;
+           check_cursor();
        }
     }
 }



Best,
Christian
-- 
...ein Schiff, das nicht mehr die hohe See hält, ist zu einem 
Küstenfahrer vielleicht immer noch nütze.
                -- Johann Wolfgang von Goethe

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