[patch] fix another End keypress lockup in the viewer

[Jindrich Makovicka]

Hello,

the new viewer has a problem with viewing files with DOS line
separators, which manifests again in a lockup after pressing the End
key. Then, it is impossible to move the view further, except by pressing
the Home key.

It is caused by the code of view_move_up, which moves by one line using
view_coord_to_offset() and then view_offset_to_coord() with offset
decremented by one. In the case of 0d/0a separator, the decremented
offset points to 0d, and view_offset_to_coord() returns the same coords.

The attached patch fixes the issue by decrementing the offset until
something else than 0d appears.

Regards,
-- 
Jindrich Makovicka
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