Fixes#1077. This was caused by the assumption that a block
cursor is represented as zero width internally and simply
rendered to be a single width selection, where as in reality
a block cursor is an actual single width selection in form and
function.
Behavioural changes:
1. Surround selection no longer works when cursor is _on_ a
surround character that has matching pairs (like `'`
or `"`). This was the intended behaviour from the start
but worked till now because of the cursor position
calculation mismatch.
* Add treesitter textobject queries
Only for Go, Python and Rust for now.
* Add tree-sitter textobjects
Only has functions and class objects as of now.
* Fix tests
* Add docs for tree-sitter textobjects
* Add guide for creating new textobject queries
* Add parameter textobject
Only parameter.inside is implemented now, parameter.around
will probably require custom predicates akin to nvim' `make-range`
since we want to select a trailing comma too (a comma will be
an anonymous node and matching against them doesn't work similar
to named nodes)
* Simplify TextObject cell init
* Fix around-word text-object selection.
* Text object around-word: select to the left if no whitespace on the right.
Also only select around when there's whitespace at all.
* Make select-word-around select all white space on a side.
* Update commented-out test case.
* Fix unused import warning from rebase.
For example when the cursor is _on_ the `'` in `'word'`, the cursor
wouldn't move because the search for a matching pair started _from_ the
position of the cursor and simply found itself.
* Add textobjects for word
* Add textobjects for surround characters
* Apply clippy lints
* Remove ThisWordPrevBound in favor of PrevWordEnd
It's the same as PrevWordEnd except for taking the current char
into account, so use a "flag" to capture that usecase
* Add tests for PrevWordEnd movement
* Remove ThisWord* movements
They did not preserve anchor positions and were only used
for textobject boundary search anyway so replace them with
simple position finding functions
* Rewrite tests of word textobject
* Add tests for surround textobject
* Add textobject docs
* Refactor textobject word position functions
* Apply clippy lints on textobject
* Fix overflow error with textobjects
Gokul Soumya
Omnikar
Nathan Vegdahl