Add function to get disp->rendering_in_progress state.

[spbgzh]

LVGL version

v9.1

What happened?

To avoid Asserted at expression: !disp->rendering_in_progress (Invalidate area is not allowed during rendering.), I need to check rendering_in_progress state, but it in lv_display_private.h, if I want to access it without "lvgl/src/display/lv_display_private.h", it will show error: invalid use of incomplete. so in this case I suggest to set a globle function to get rendering_in_progress state

How to reproduce?

#include "lvgl/src/display/lv_display_private.h" static uint8_t perform_screen_transition(lv_screen_to_t *transition) { if (disp->rendering_in_progress) { return 0; } if (transition == NULL || transition->next == NULL) return 0; if (transition->next->screen == NULL && transition->next->init != NULL) transition->next->init(); if (transition->next->screen != NULL) { lv_screen_load_anim(transition->next->screen, transition->anim, transition->speed, transition->delay, false); node = *(transition->next); return 1; } return 0; }

[spbgzh]

I made a PR https://github.com/lvgl/lvgl/pull/6448

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