Use clrtoeol to draw blank lines

babi/file.py

@@ -811,9 +811,9 @@ class File:
             x = self.x if line_idx == self.y else 0
             line = scrolled_line(line, x, curses.COLS)
             stdscr.insstr(i + margin.header, 0, line)
-        blankline = ' ' * curses.COLS
         for i in range(to_display, margin.body_lines):
-            stdscr.insstr(i + margin.header, 0, blankline)
+            stdscr.move(i + margin.header, 0)
+            stdscr.clrtoeol()
 
         if self.select_start is not None:
             (s_y, s_x), (e_y, e_x) = self._get_selection()

tests/features/conftest.py

@@ -148,21 +148,25 @@ class CursesScreen:
     def keypad(self, val):
         pass
 
+    def nodelay(self, val):
+        self._runner.screen.nodelay = val
+
     def insstr(self, y, x, s, attr=0):
         self._runner.screen.insstr(y, x, s)
 
+    def clrtoeol(self):
+        s = self._runner.screen.width * ' '
+        self.insstr(self._runner.screen.y, self._runner.screen.x, s)
+
+    def chgat(self, y, x, n, color):
+        pass
+
     def move(self, y, x):
         self._runner.screen.move(y, x)
 
     def get_wch(self):
         return self._runner._get_wch()
 
-    def chgat(self, y, x, n, color):
-        pass
-
-    def nodelay(self, val):
-        self._runner.screen.nodelay = val
-
 
 class Key(NamedTuple):
     tmux: str