TortoiseMerge tries to save changes into temporary file

TortoiseSVN 1.4.3, Build 8752 - 32 Bit -dev,

What I did:
1) From "Show log" dialog, select a revision which changed a file
2) Double-click on the changed file to show diff in TortoiseMerge
3) Right-click a changed line on the left pane, select 'Use this text
block' from context menu
4) Press "save changes" button.

What happened:
"Could not open the file <temp_file_name>" error message displayed,
"Save changes" button disabled, nothing actually saved to disk.

What I expected:
There are several related but separate issues here, I think:

1) If error happens during saving, changes should not be marked as
saved. Better yet "Retry, Abort, Ignore" - type dialog should be
displayed.

2) If the TortoiseMerge knows it can not save changes, it should not
allow used to make them.

3) Ideal solution would be if TMerge attempted to save changes to a
working copy, however I understand that it is not a trivial feature.
If developers think this idea is worth implementing (for at least
filing an issue), I shall be happy to provide my thoughts about its
design.
What I actually wanted to do is to partially revert changes made to a
file in some past revision. If there is a better way to do it already,
please educate me.

-- 
Alexander S. Klenin
Insight Experts Ltd.
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