Clear prompt markings when erasing the display

Fixes prompt detection failing after ctrl+l

docs/changelog.rst

@@ -10,7 +10,7 @@ To update |kitty|, :doc:`follow the instructions <binary>`.
 - Integrate kitty closely with common shells such as zsh, fish and bash.
   This allows lots of niceties such as jumping to previous prompts, opening the
   output of the last command in a new window, etc. See :ref:`shell_integration`
-  for details.
+  for details. Packagers please read :ref:`packagers`.
 
 - A new shortcut :sc:`focus_visible_window` to visually focus a window using
   the keyboard. Pressing it causes numbers to appear over each visible window

kitty/line-buf.c

@@ -57,6 +57,12 @@ linebuf_mark_line_as_not_continued(LineBuf *self, index_type y) {
     self->line_attrs[y].continued = false;
 }
 
+void
+linebuf_clear_attrs_and_dirty(LineBuf *self, index_type y) {
+    self->line_attrs[y].val = 0;
+    self->line_attrs[y].has_dirty_text = true;
+}
+
 static PyObject*
 clear(LineBuf *self, PyObject *a UNUSED) {
 #define clear_doc "Clear all lines in this LineBuf"

kitty/lineops.h

@@ -103,6 +103,7 @@ void linebuf_delete_lines(LineBuf *self, index_type num, index_type y, index_typ
 void linebuf_copy_line_to(LineBuf *, Line *, index_type);
 void linebuf_rewrap(LineBuf *self, LineBuf *other, index_type *, index_type *, HistoryBuf *, index_type *, index_type *, index_type *, index_type *, ANSIBuf*);
 void linebuf_mark_line_dirty(LineBuf *self, index_type y);
+void linebuf_clear_attrs_and_dirty(LineBuf *self, index_type y);
 void linebuf_mark_line_clean(LineBuf *self, index_type y);
 void linebuf_mark_line_as_not_continued(LineBuf *self, index_type y);
 unsigned int linebuf_char_width_at(LineBuf *self, index_type x, index_type y);

kitty/screen.c

@@ -1647,15 +1647,14 @@ screen_erase_in_display(Screen *self, unsigned int how, bool private) {
             } else {
                 line_apply_cursor(self->linebuf->line, self->cursor, 0, self->columns, true);
             }
-            linebuf_mark_line_dirty(self->linebuf, i);
-            linebuf_mark_line_as_not_continued(self->linebuf, i);
+            linebuf_clear_attrs_and_dirty(self->linebuf, i);
         }
         self->is_dirty = true;
         clear_selection(&self->selections);
     }
     if (how != 2) {
         screen_erase_in_line(self, how, private);
-        if (how == 1) linebuf_mark_line_as_not_continued(self->linebuf, self->cursor->y);
+        if (how == 1) linebuf_clear_attrs_and_dirty(self->linebuf, self->cursor->y);
     }
     if (how == 3 && self->linebuf == self->main_linebuf) {
         historybuf_clear(self->historybuf);