TMerge undo and other questions

Hi folks,

In TMerge if I make some changes (use this block) and save, then realise
that the last one was a mistake and undo it, the save button is still
greyed out so I cannot re-save the file with the correction.

Is there a limit to the number of undo levels, or is it just memory limited?

It might be more intuitive when undoing a change if the current line
jumps to the site of the undo. ATM if I select 'Undo' I cannot see the
result of what I undid without searching for it.

Should there be a 'redo', possibly for one level only? Common practice
(for me) when I am not sure how many changes I need to undo is to keep
undoing until I get to one I want to keep, then redo that last one.
/me running and hiding

In the current nightly version of TMerge I cannot see added and deleted
blank lines properly. Even with the 'compare white spaces option',
deleting a blank line results in a 'whitespace-only change' blob in both
panes. The only way to tell whether space was added or removed is by
looking at the line numbers. And if I 'use other text block' then I
cannot tell at all because the line numbers are not recalculated. Two
issues here:
1. adding and deleting whole lines should perhaps be treated differently
from adding/deleting space within a line, at least in compare whitespace
mode.
2. When two blocks are made equal using 'use this text block', could
they perhaps be marked using an '=' sign on both sides, rather than
+/-/O to show that the difference has been removed? ATM I get a
whitespace-only change mark appearing, when there is really no
difference at all. The alternative (showing no mark at all) loses the
fact that there is a difference in the file content which has just been
removed.

Simon

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