Apply default colors in diff kitten

kittens/tui/handler.py

@@ -14,6 +14,7 @@ class Handler:
         self.initialize()
 
     def __exit__(self, *a):
+        del self.write_buf[:]
         self.finalize()
 
     def initialize(self):

kittens/tui/loop.py

@@ -376,8 +376,12 @@ class Loop:
                 self.return_code = 1
                 keep_going = False
 
+            finalize_output = b''.join(handler.write_buf).decode('utf-8')
+
             if tb is not None:
-                self._report_error_loop(tb, term_manager)
+                self._report_error_loop(finalize_output + tb, term_manager)
+        if tb is None:
+            os.write(self.output_fd, finalize_output.encode('utf-8'))
 
     def _report_error_loop(self, tb, term_manager):
         select = self.sel.select

kittens/tui/operations.py

@@ -5,7 +5,7 @@
 import sys
 from contextlib import contextmanager
 
-from kitty.rgb import color_as_sharp, to_color
+from kitty.rgb import Color, color_as_sharp, to_color
 from kitty.terminfo import string_capabilities
 
 S7C1T = '\033 F'
@@ -168,9 +168,9 @@ def set_default_colors(fg=None, bg=None):
     if fg is None:
         ans += '\x1b]110\x1b\\'
     else:
-        ans += '\x1b]10;{}\x1b\\'.format(color_as_sharp(to_color(fg)))
+        ans += '\x1b]10;{}\x1b\\'.format(color_as_sharp(fg if isinstance(fg, Color) else to_color(fg)))
     if bg is None:
         ans += '\x1b]111\x1b\\'
     else:
-        ans += '\x1b]11;{}\x1b\\'.format(color_as_sharp(to_color(bg)))
+        ans += '\x1b]11;{}\x1b\\'.format(color_as_sharp(bg if isinstance(bg, Color) else to_color(bg)))
     return ans