gdk: drop uneeded nullable_return_is_error
The texture::*_bytes functions are not nullable compared
to the ones that download to a file, because the file might
not be writeable for example
@@ -622,17 +622,9 @@ manual_traits = ["TextureExtManual"]
[object.function.return]
bool_return_is_error = "Failed to save the texture as png"
[[object.function]]
- name = "save_to_png_bytes"
- [object.function.return]
- nullable_return_is_error = "Failed to save the texture as png bytes"
- [[object.function]]
name = "save_to_tiff"
[object.function.return]
bool_return_is_error = "Failed to save the texture as tiff"
- [[object.function]]
- name = "save_to_tiff_bytes"
- [object.function.return]
- nullable_return_is_error = "Failed to save the texture as tiff bytes"
[[object]]
name = "Gdk.Toplevel"
