vim: Fix linewise copy of last line with no trailing newline

Along the way, delete the VimBindingTestContext by updating the
visual tests to no-longer need it.

crates/vim/src/test/vim_test_context.rs

@@ -8,8 +8,6 @@ use search::{BufferSearchBar, ProjectSearchBar};
 
 use crate::{state::Operator, *};
 
-use super::VimBindingTestContext;
-
 pub struct VimTestContext<'a> {
     cx: EditorLspTestContext<'a>,
 }
@@ -126,14 +124,6 @@ impl<'a> VimTestContext<'a> {
         assert_eq!(self.mode(), mode_after, "{}", self.assertion_context());
         assert_eq!(self.active_operator(), None, "{}", self.assertion_context());
     }
-
-    pub fn binding<const COUNT: usize>(
-        mut self,
-        keystrokes: [&'static str; COUNT],
-    ) -> VimBindingTestContext<'a, COUNT> {
-        let mode = self.mode();
-        VimBindingTestContext::new(keystrokes, mode, mode, self)
-    }
 }
 
 impl<'a> Deref for VimTestContext<'a> {