Replace use of insert_str_at with insert_str

src/engine.rs

@@ -392,11 +392,8 @@ impl Reedline {
     }
 
     fn insert_cut_buffer(&mut self) {
-        let insertion_offset = self.insertion_point().offset;
         let cut_buffer = self.cut_buffer.get();
-        self.line_buffer
-            .insert_str_at(self.insertion_point(), &cut_buffer);
-        self.set_insertion_point(insertion_offset + cut_buffer.len());
+        self.line_buffer.insert_str(&cut_buffer);
     }
 
     fn uppercase_word(&mut self) {

src/line_buffer.rs

@@ -143,19 +143,15 @@ impl LineBuffer {
         self.move_right();
     }
 
+    /// Insert `&str` at the `idx` position in the current line.
+    ///
+    /// TODO: Check unicode validation
     pub fn insert_str(&mut self, string: &str) {
         let pos = self.insertion_point();
         self.lines[pos.line].insert_str(pos.offset, string);
         self.insertion_point.offset = pos.offset + string.len();
     }
 
-    /// Insert `&str` at the `idx` position in the current line.
-    ///
-    /// TODO: Check unicode validation
-    pub fn insert_str_at(&mut self, pos: InsertionPoint, string: &str) {
-        self.lines[pos.line].insert_str(pos.offset, string)
-    }
-
     /// Empty buffer and reset cursor
     pub fn clear(&mut self) {
         self.lines.clear();