recalc_input_lines: function() {
       if (this.mode.has_input_prompt) {
           let _ = null;
-          [this.input_lines, _] = this.msg_into_lines_of_width(this.input_prompt + this.inputEl.value, this.window_width);
+          [this.input_lines, _] = this.msg_into_lines_of_width(this.input_prompt + this.inputEl.value + '█', this.window_width);
       } else {
           this.input_lines = [];
       }
 };
 tui.inputEl.addEventListener('keydown', (event) => {
     tui.show_help = false;
-    if (event.key == 'Enter') {
+    if (['Enter', 'ArrowLeft', 'ArrowRight'].includes(event.key)) {
         event.preventDefault();
     }
     if ((!tui.mode.is_intro && event.key == 'Escape')
 
             if not self.mode.has_input_prompt:
                 self.input_lines = []
             else:
-                self.input_lines = msg_into_lines_of_width(input_prompt + self.input_,
+                self.input_lines = msg_into_lines_of_width(input_prompt
+                                                           + self.input_ + '█',
                                                            self.window_width)
 
         def move_explorer(direction):