TortoiseIDiff UI nits

Hi folks,

Found a couple of minor inconsistencies in TortoiseIDiff while
updating the docs.

1. Scroll wheel will scroll the page up and down forever. Set 'fit to
window' and you get a clean window with no scroll bars. Move the
scroll wheel and the image moves, even though it is not helping you to
see anything else. I don't see any point in scrolling any further up
once the bottom edge of the (combined) image has reached the bottom
edge of the window, or scrolling down when the top edge of the image
is at the top of the window.

2. The (english) menu entry and tooltip are 'Overlap images' where the
docs refer to 'Overlay images'. I think overlay is a more accurate
description. If two circles overlap it normally means that there is
some common ground between them, whereas overlay implies looking
through one to see the other (like an icon overlay).

3. Click on 1:1 for an image which is too big for the window. Click on
fit-to-window and image zooms out to fit. Click on fit-to-window again
and image changes zoom or position a little. Why?

4. When image overlay is not in use, alpha blend is greyed out when
disabled but shown in colour when alpha blend is enabled, even though
you can't use blending. It should always be greyed out when not
overlaid.

5. Maybe split-vertical should be greyed out in alpha blend mode?

Simon

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