diff --git a/kitty/cursor.c b/kitty/cursor.c
index a25950f3f..249b7b614 100644
--- a/kitty/cursor.c
+++ b/kitty/cursor.c
@@ -36,15 +36,20 @@ repr(Cursor *self) {
     );
 }
 
+static inline void cursor_reset_display_attrs(Cursor *self) {
+    self->bg = 0; self->fg = 0; self->decoration_fg = 0;
+    self->decoration = 0; self->bold = false; self->italic = false; self->reverse = false; self->strikethrough = false;
+}
+
 static PyObject *
 reset_display_attrs(Cursor *self) {
 #define reset_display_attrs_doc "Reset all display attributes to unset"
-    self->bg = 0; self->fg = 0; self->decoration_fg = 0;
-    self->decoration = 0; self->bold = false; self->italic = false; self->reverse = false; self->strikethrough = false;
+    cursor_reset_display_attrs(self);
     Py_RETURN_NONE;
 }
 
 void cursor_reset(Cursor *self) {
+    cursor_reset_display_attrs(self);
     self->x = 0; self->y = 0;
     self->shape = 0; self->blink = false;
     self->color = 0; self->hidden = false;
diff --git a/kitty/data-types.h b/kitty/data-types.h
index 2ec3bf5d4..5e3a1a32e 100644
--- a/kitty/data-types.h
+++ b/kitty/data-types.h
@@ -271,28 +271,33 @@ PyObject* parse_bytes_dump(PyObject UNUSED *, PyObject *);
 PyObject* parse_bytes(PyObject UNUSED *, PyObject *);
 uint16_t* translation_table(char);
 uint32_t decode_utf8(uint32_t*, uint32_t*, uint8_t byte);
-void linebuf_init_line(LineBuf *, index_type);
+void cursor_reset(Cursor*);
+Cursor* cursor_copy(Cursor*);
+bool update_cell_range_data(SpriteMap *, Line *, unsigned int, unsigned int, ColorProfile *, const uint32_t, const uint32_t, unsigned int *);
+uint32_t to_color(ColorProfile *, uint32_t, uint32_t);
+
+PyObject* line_text_at(char_type, combining_type);
+void line_clear_text(Line *self, unsigned int at, unsigned int num, int ch);
+void line_apply_cursor(Line *self, Cursor *cursor, unsigned int at, unsigned int num, bool clear_char);
 void line_set_char(Line *, unsigned int , uint32_t , unsigned int , Cursor *);
 void line_right_shift(Line *, unsigned int , unsigned int );
 void line_add_combining_char(Line *, uint32_t , unsigned int );
-void cursor_reset(Cursor*);
-void linebuf_set_attribute(LineBuf *, unsigned int , unsigned int );
-Cursor* cursor_copy(Cursor*);
+
+void linebuf_init_line(LineBuf *, index_type);
 void linebuf_clear(LineBuf *);
+void linebuf_init_line(LineBuf *, index_type);
+void linebuf_index(LineBuf* self, index_type top, index_type bottom);
+void linebuf_clear_line(LineBuf *self, index_type y);
+void linebuf_insert_lines(LineBuf *self, unsigned int num, unsigned int y, unsigned int bottom);
+void linebuf_delete_lines(LineBuf *self, index_type num, index_type y, index_type bottom);
+void linebuf_set_attribute(LineBuf *, unsigned int , unsigned int );
+
 void screen_restore_cursor(Screen *);
 void screen_save_cursor(Screen *);
 void screen_cursor_position(Screen*, unsigned int, unsigned int);
 void screen_erase_in_display(Screen *, unsigned int, bool);
 void screen_draw(Screen *screen, uint8_t *buf, unsigned int buflen);
-bool update_cell_range_data(SpriteMap *, Line *, unsigned int, unsigned int, ColorProfile *, const uint32_t, const uint32_t, unsigned int *);
-uint32_t to_color(ColorProfile *, uint32_t, uint32_t);
-PyObject* line_text_at(char_type, combining_type);
-void linebuf_init_line(LineBuf *, index_type);
-void linebuf_index(LineBuf* self, index_type top, index_type bottom);
-void linebuf_clear_line(LineBuf *self, index_type y);
 void screen_ensure_bounds(Screen *self, bool use_margins);
-void line_clear_text(Line *self, unsigned int at, unsigned int num, int ch);
-void line_apply_cursor(Line *self, Cursor *cursor, unsigned int at, unsigned int num, bool clear_char);
 void screen_toggle_screen_buffer(Screen *self);
 void screen_normal_keypad_mode(Screen *self); 
 void screen_alternate_keypad_mode(Screen *self);  
diff --git a/kitty/line-buf.c b/kitty/line-buf.c
index 91919900f..fe9233a27 100644
--- a/kitty/line-buf.c
+++ b/kitty/line-buf.c
@@ -266,13 +266,9 @@ is_continued(LineBuf *self, PyObject *val) {
     Py_RETURN_FALSE;
 }
 
-static PyObject*
-insert_lines(LineBuf *self, PyObject *args) {
-#define insert_lines_doc "insert_lines(num, y, bottom) -> Insert num blank lines at y, only changing lines in the range [y, bottom]."
-    unsigned int y, num, bottom;
+void linebuf_insert_lines(LineBuf *self, unsigned int num, unsigned int y, unsigned int bottom) {
     index_type i;
-    if (!PyArg_ParseTuple(args, "III", &num, &y, &bottom)) return NULL;
-    if (y >= self->ynum || y > bottom || bottom >= self->ynum) { PyErr_SetString(PyExc_ValueError, "Out of bounds"); return NULL; }
+    if (y >= self->ynum || y > bottom || bottom >= self->ynum) return;
     index_type ylimit = bottom + 1;
     num = MIN(ylimit - y, num);
     if (num > 0) {
@@ -294,12 +290,22 @@ insert_lines(LineBuf *self, PyObject *args) {
             self->continued_map[i] = 0;
         }
     }
+}
+
+static PyObject*
+insert_lines(LineBuf *self, PyObject *args) {
+#define insert_lines_doc "insert_lines(num, y, bottom) -> Insert num blank lines at y, only changing lines in the range [y, bottom]."
+    unsigned int y, num, bottom;
+    if (!PyArg_ParseTuple(args, "III", &num, &y, &bottom)) return NULL;
+    linebuf_insert_lines(self, num, y, bottom);
     Py_RETURN_NONE;
 }
 
-static inline void do_delete(LineBuf *self, index_type num, index_type y, index_type bottom) {
+void linebuf_delete_lines(LineBuf *self, index_type num, index_type y, index_type bottom) {
     index_type i;
     index_type ylimit = bottom + 1;
+    num = MIN(bottom + 1 - y, num);
+    if (y >= self->ynum || y > bottom || bottom >= self->ynum || num < 1) return;
     for (i = y; i < y + num; i++) {
         self->scratch[i] = self->line_map[i];
     }
@@ -324,11 +330,7 @@ delete_lines(LineBuf *self, PyObject *args) {
 #define delete_lines_doc "delete_lines(num, y, bottom) -> Delete num blank lines at y, only changing lines in the range [y, bottom]."
     unsigned int y, num, bottom;
     if (!PyArg_ParseTuple(args, "III", &num, &y, &bottom)) return NULL;
-    if (y >= self->ynum || y > bottom || bottom >= self->ynum) { PyErr_SetString(PyExc_ValueError, "Out of bounds"); return NULL; }
-    num = MIN(bottom + 1 - y, num);
-    if (num > 0) {
-        do_delete(self, num, y, bottom);
-    }
+    linebuf_delete_lines(self, num, y, bottom);
     Py_RETURN_NONE;
 }
  
diff --git a/kitty/line.c b/kitty/line.c
index 4ccc92eed..23636438c 100644
--- a/kitty/line.c
+++ b/kitty/line.c
@@ -207,12 +207,16 @@ void line_apply_cursor(Line *self, Cursor *cursor, unsigned int at, unsigned int
     char_type attrs = CURSOR_TO_ATTRS(cursor, 1);
     color_type col = (cursor->fg & COL_MASK) | ((color_type)(cursor->bg & COL_MASK) << COL_SHIFT);
     decoration_type dfg = cursor->decoration_fg & COL_MASK;
+    if (!clear_char) attrs = ((attrs >> ATTRS_SHIFT) & ~WIDTH_MASK) << ATTRS_SHIFT;
     
     for (index_type i = at; i < self->xnum && i < at + num; i++) {
         if (clear_char) {
             self->chars[i] = 32 | attrs;
             self->combining_chars[i] = 0;
-        } else self->chars[i] = (self->chars[i] & CHAR_MASK) | attrs;
+        } else {
+            char_type w = ((self->chars[i] >> ATTRS_SHIFT) & WIDTH_MASK) << ATTRS_SHIFT;
+            self->chars[i] = (self->chars[i] & CHAR_MASK) | attrs | w;
+        }
         self->colors[i] = col;
         self->decoration_fg[i] = dfg;
     }
diff --git a/kitty/screen.c b/kitty/screen.c
index 3bf0994c4..288268544 100644
--- a/kitty/screen.c
+++ b/kitty/screen.c
@@ -34,6 +34,7 @@ new(PyTypeObject *type, PyObject *args, PyObject UNUSED *kwds) {
         self->cursor = alloc_cursor();
         self->main_linebuf = alloc_linebuf(lines, columns); self->alt_linebuf = alloc_linebuf(lines, columns);
         self->linebuf = self->main_linebuf;
+        // TODO: Change the savepoints objects to use a circular buffer, so there are no mallocs during normal operation
         self->main_savepoints = PyList_New(0); self->alt_savepoints = PyList_New(0);
         self->savepoints = self->main_savepoints;
         self->change_tracker = alloc_change_tracker(lines, columns);
@@ -184,19 +185,6 @@ void screen_shift_in(Screen UNUSED *self, uint8_t UNUSED ch) {
     // TODO: Implement this
 }
 
-void screen_toggle_screen_buffer(Screen *self) {
-    screen_save_cursor(self);
-    if (self->linebuf == self->main_linebuf) {
-        self->linebuf = self->alt_linebuf;
-        self->savepoints = self->alt_savepoints;
-    } else {
-        self->linebuf = self->main_linebuf;
-        self->savepoints = self->main_savepoints;
-    }
-    screen_restore_cursor(self);
-    tracker_update_screen(self->change_tracker);
-}
-
 // Graphics {{{
 void screen_change_default_color(Screen *self, unsigned int which, uint32_t col) {
     if (self->callbacks == Py_None) return;
@@ -210,6 +198,19 @@ void screen_change_default_color(Screen *self, unsigned int which, uint32_t col)
 
 // Modes {{{
 
+void screen_toggle_screen_buffer(Screen *self) {
+    screen_save_cursor(self);
+    if (self->linebuf == self->main_linebuf) {
+        self->linebuf = self->alt_linebuf;
+        self->savepoints = self->alt_savepoints;
+    } else {
+        self->linebuf = self->main_linebuf;
+        self->savepoints = self->main_savepoints;
+    }
+    screen_restore_cursor(self);
+    tracker_update_screen(self->change_tracker);
+}
+
 void screen_normal_keypad_mode(Screen UNUSED *self) {} // Not implemented as this is handled by the GUI
 void screen_alternate_keypad_mode(Screen UNUSED *self) {}  // Not implemented as this is handled by the GUI
 
@@ -517,6 +518,61 @@ void screen_erase_in_display(Screen *self, unsigned int how, bool private) {
         screen_erase_in_line(self, how, private);
     }
 }
+
+void screen_insert_lines(Screen *self, unsigned int count) {
+    unsigned int top = self->margin_top, bottom = self->margin_bottom;
+    if (count == 0) count = 1;
+    if (top <= (unsigned int)self->cursor->y && (unsigned int)self->cursor->y <= bottom) {
+        linebuf_insert_lines(self->linebuf, count, self->cursor->y, bottom);
+        tracker_update_line_range(self->change_tracker, self->cursor->y, bottom);
+        screen_carriage_return(self, 13);
+    }
+}
+
+void screen_delete_lines(Screen *self, unsigned int count) {
+    unsigned int top = self->margin_top, bottom = self->margin_bottom;
+    if (count == 0) count = 1;
+    if (top <= (unsigned int)self->cursor->y && (unsigned int)self->cursor->y <= bottom) {
+        linebuf_delete_lines(self->linebuf, count, self->cursor->y, bottom);
+        tracker_update_line_range(self->change_tracker, self->cursor->y, bottom);
+        screen_carriage_return(self, 13);
+    }
+}
+
+void screen_insert_characters(Screen *self, unsigned int count) {
+    unsigned int top = self->margin_top, bottom = self->margin_bottom;
+    if (count == 0) count = 1;
+    if (top <= (unsigned int)self->cursor->y && (unsigned int)self->cursor->y <= bottom) {
+        unsigned int x = self->cursor->x;
+        unsigned int num = MIN(self->columns - x, count);
+        linebuf_init_line(self->linebuf, self->cursor->y);
+        line_right_shift(self->linebuf->line, x, num);
+        line_apply_cursor(self->linebuf->line, self->cursor, x, num, true);
+        tracker_update_cell_range(self->change_tracker, self->cursor->y, x, self->columns - 1);
+    }
+}
+
+void screen_delete_characters(Screen *self, unsigned int count) {
+    unsigned int top = self->margin_top, bottom = self->margin_bottom;
+    if (count == 0) count = 1;
+    if (top <= (unsigned int)self->cursor->y && (unsigned int)self->cursor->y <= bottom) {
+        unsigned int x = self->cursor->x;
+        unsigned int num = MIN(self->columns - x, count);
+        linebuf_init_line(self->linebuf, self->cursor->y);
+        left_shift_line(self->linebuf->line, x, num);
+        line_apply_cursor(self->linebuf->line, self->cursor, self->columns - num, num, true);
+        tracker_update_cell_range(self->change_tracker, self->cursor->y, x, self->columns - 1);
+    }
+}
+
+void screen_erase_characters(Screen *self, unsigned int count) {
+    if (count == 0) count = 1;
+    unsigned int x = self->cursor->x;
+    unsigned int num = MIN(self->columns - x, count);
+    linebuf_init_line(self->linebuf, self->cursor->y);
+    line_apply_cursor(self->linebuf->line, self->cursor, x, num, true);
+    tracker_update_cell_range(self->change_tracker, self->cursor->y, x, MIN(x + num, self->columns) - 1);
+}
 // }}}
 
 // Python interface {{{
@@ -590,6 +646,40 @@ cursor_back(Screen *self, PyObject *args) {
     Py_RETURN_NONE;
 }
 
+static PyObject*
+erase_in_line(Screen *self, PyObject *args) {
+#define erase_in_line_doc ""
+    bool private = false;
+    unsigned int how = 0;
+    if (!PyArg_ParseTuple(args, "|Ip", &how, &private)) return NULL;
+    screen_erase_in_line(self, how, private);
+    Py_RETURN_NONE;
+}
+
+static PyObject*
+erase_in_display(Screen *self, PyObject *args) {
+#define erase_in_display_doc ""
+    bool private = false;
+    unsigned int how = 0;
+    if (!PyArg_ParseTuple(args, "|Ip", &how, &private)) return NULL;
+    screen_erase_in_display(self, how, private);
+    Py_RETURN_NONE;
+}
+
+#define COUNT_WRAP(name) \
+    static PyObject* name(Screen *self, PyObject *args) { \
+    unsigned int count = 1; \
+    if (!PyArg_ParseTuple(args, "|I", &count)) return NULL; \
+    screen_##name(self, count); \
+    Py_RETURN_NONE; }
+COUNT_WRAP(insert_lines)
+COUNT_WRAP(delete_lines)
+COUNT_WRAP(insert_characters)
+COUNT_WRAP(delete_characters)
+COUNT_WRAP(erase_characters)
+
+#define MND(name, args) {#name, (PyCFunction)name, args, ""},
+
 static PyMethodDef methods[] = {
     METHOD(line, METH_O)
     METHOD(draw, METH_VARARGS)
@@ -601,6 +691,13 @@ static PyMethodDef methods[] = {
     METHOD(reset_dirty, METH_NOARGS)
     METHOD(consolidate_changes, METH_NOARGS)
     METHOD(cursor_back, METH_VARARGS)
+    METHOD(erase_in_line, METH_VARARGS)
+    METHOD(erase_in_display, METH_VARARGS)
+    MND(insert_lines, METH_VARARGS)
+    MND(delete_lines, METH_VARARGS)
+    MND(insert_characters, METH_VARARGS)
+    MND(delete_characters, METH_VARARGS)
+    MND(erase_characters, METH_VARARGS)
 
     {NULL}  /* Sentinel */
 };
diff --git a/kitty_tests/screen.py b/kitty_tests/screen.py
index 9c550fb9e..789a6f822 100644
--- a/kitty_tests/screen.py
+++ b/kitty_tests/screen.py
@@ -4,7 +4,7 @@
 
 from . import BaseTest
 
-from kitty.fast_data_types import DECAWM, IRM
+from kitty.fast_data_types import DECAWM, IRM, Cursor
 
 
 class TestScreen(BaseTest):
@@ -55,7 +55,7 @@ class TestScreen(BaseTest):
 
     def test_draw_char(self):
         # Test in line-wrap, non-insert mode
-        s = self.create_screen()
+        s = self.create_screen2()
         s.draw('ココx'.encode('utf-8'))
         self.ae(str(s.line(0)), 'ココx')
         self.ae(tuple(map(s.line(0).width, range(5))), (2, 0, 2, 0, 1))
@@ -103,7 +103,7 @@ class TestScreen(BaseTest):
         self.assertChanges(s, ignore='cursor', cells={4: ((0, 4),)})
 
     def test_char_manipulation(self):
-        s = self.create_screen()
+        s = self.create_screen2()
 
         def init():
             s.reset(), s.reset_dirty()
@@ -128,6 +128,10 @@ class TestScreen(BaseTest):
         s.insert_characters(1)
         self.ae(str(s.line(0)), ' xコ ')
         self.assertChanges(s, ignore='cursor', cells={0: ((0, 4),)})
+        c = Cursor()
+        c.bold = True
+        s.line(0).apply_cursor(c, 0, 5)
+        self.ae(s.line(0).width(2), 2)
 
         init()
         s.delete_characters(2)
@@ -160,7 +164,7 @@ class TestScreen(BaseTest):
         self.ae(str(s.line(0)), '     ')
         self.assertChanges(s, cells={0: ((0, 4),)})
         init()
-        s.erase_in_line(2, private=True)
+        s.erase_in_line(2, True)
         self.ae((False, False, False, False, False), tuple(map(lambda i: s.line(0).cursor_from(i).bold, range(5))))
 
     def test_erase_in_screen(self):