Mention combining characters in the template

[xfq]

Fix #103.

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[aphillips]

I think we should abandon this PR, since we now have guidance on using images.

[xfq]

The current text says "For invisible characters (such as control characters) or for whitespace, use an image instead of the character", but does not mention combining characters. I think we should add that.

By the way, I think whitespace are also "invisible", and some of them are also control characters.

[r12a]

The combining characters often work ok without the need for images. If the font behaves well, it will typically add a dotted circle when displaying isolated combining marks. So an image is only needed sometimes.

[aphillips]

Any update? Should we keep this or abandon?

[xfq]

I still think it's useful to mention combining characters in the template. Since there are merge conflicts, I will close this PR and craft a new one.

[xfq]

The combining characters often work ok without the need for images. If the font behaves well, it will typically add a dotted circle when displaying isolated combining marks. So an image is only needed sometimes.

I found that the font didn't behave well on my system (without changing any font-related preferences), so it may appear for other users as well. Maybe we should use images?

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Screenshot:

It's Chrome 120 on macOS 14.2. The rendered font seems to be Hiragino Sans.