added cut_buffer_begin command and vim binding

src/keybind/builtin/vim.json

@@ -61,6 +61,7 @@
             ["db", "cut_word_left_vim"],
             ["dd", "cut_internal_vim"],
             ["dG", "cut_buffer_end"],
+            ["dgg", "cut_buffer_begin"],
             ["\"_dd", "delete_line"],
 
             ["cc", ["enter_mode", "insert"], ["cut_internal_vim"]],

src/tui/editor.zig

@@ -2970,6 +2970,15 @@ pub const Editor = struct {
     }
     pub const cut_buffer_end_meta: Meta = .{ .description = "Cut to the end of the buffer (copies cut text into clipboard)" };
 
+    pub fn cut_buffer_begin(self: *Self, _: Context) Result {
+        const b = try self.buf_for_update();
+        const text, const root = try self.cut_to(move_cursor_buffer_begin, b.root);
+        self.set_clipboard_internal(text);
+        try self.update_buf(root);
+        self.clamp();
+    }
+    pub const cut_buffer_begin_meta: Meta = .{ .description = "Cut to the beginning of the buffer (copies cut text into clipboard)" };
+
     pub fn cut_word_left_vim(self: *Self, _: Context) Result {
         const b = try self.buf_for_update();
         const text, const root = try self.cut_to(move_cursor_word_left_vim, b.root);