Patch from ch3cooli:
tidy up a bit.

git-svn-id: http://tortoisesvn.googlecode.com/svn/trunk/src/TortoiseMerge@24216 4cfb86a4-2c7a-11df-bd14-c1e331e6ceac
* when saving, copy the file parameters first
* remove 'using': never use that in a header file

git-svn-id: http://tortoisesvn.googlecode.com/svn/trunk/src/TortoiseMerge@24217 4cfb86a4-2c7a-11df-bd14-c1e331e6ceac
On XP: Save the left view if it's the only one modified. Save all views if more than one is modified.

git-svn-id: http://tortoisesvn.googlecode.com/svn/trunk/src/TortoiseMerge@24218 4cfb86a4-2c7a-11df-bd14-c1e331e6ceac