Place TODO keyword of previous header in the new header

[schoettl]

This should close #20

@munen When editing the title of a header (pressing the title edit icon), shouldn't we place the curser at the end of the line by default? At least for new headers (with a TODO keyword) this would make very much sense. And for existing headers with much text it wouldn't hurt, what do you think?

[schoettl]

Setting the curser position in the text input works on Arch Chromium and Firefox and Android Chrome.

Can you test on iPhone before merge?

[munen]

I really like the implementation of "Place TODO keyword of previous header in the new header". Nice that you put your first code into a reducer(;

I'll write an acceptance test for it and merge.

As for:

When editing the title of a header (pressing the title edit icon), shouldn't we place the curser at the end of the line by default?

I understand that you like this. However, it would be breaking UX change. Plus, for me personally, I don't think it would be a good default. My headlines are not all short, so when having the cursor at the end, I might not be able to read the beginning of the headline.

Having said this, I really do understand that you like this. I removed your commit from this PR (as it is a separate feature) and opened a new PR for it. We can totally add the feature, but my proposal is that we introduce a setting for the behavior with the default set to false. Would that work for you?

[munen]

@schoettl Great new feature, thanks for implementing it! 🙏

I've written an acceptance test and updated the changelog with attribution.