Not use the lv_obj_is_valid() in ui_theme_manager.c

[Hermit]

Find my latest thoughts about this here:

Themes Drastically slowing down Screen/Component Generation

The LVGL-discussion which the other topic ( Not use the lv_obj_is_valid() in ui_theme_manager.c ) mentions was closed without an improvement for lv_obj_is_valid, as I see in LVGL-9.2 source-code. So lv_obj_is_valid can/should really be removed where it isn’t really necessary. I think it can be removed at least from ui_object_set_themeable_style_property() because SLS (and hopefully the user-code) won’t call this function on a non-existing widget. However, it can’t inevitably be removed from the …