Following on from #1751: originally Switch was called Checkbox and the
moving part was, for the component class, called a checkbox--switch; after
renaming the widget to Switch that component class ended up being
switch--switch; which wasn't ideal.
We decided to go with it as-is, but I just realised that internally the code
calls it a slider. So this leans into that and I'm renaming the component
class switch--slider. This removes the doubling-up of the name and also
makes the code more consistent.
A new form of Checkbox will be arriving in Textual soon, working in
conjunction with a RadioButton. What was called Checkbox is perhaps a wee
bit heavyweight in terms of visual design, but is a style of widget that
should remain.
With this in mind we're renaming the current Checkbox to Switch. In all
other respects its workings remains the same, only the name has changed.
Things for people to watch out for:
- Imports will need to be updated.
- Queries will need to be updated; special attention will need to be paid to
any queries that are string-based.
- CSS will need to be changed if any Checkbox styling is happening, or if
any Checkbox component styles are being used.
See #1725 as the initial motivation and #1746 as the issue for this
particular change.
