Add light fading to FadeFakeFloor

* Declare P_RemoveLighting in header for p_spec.c use

src/p_lights.c

@@ -25,7 +25,7 @@
   *
   * \param sector The sector to remove effects from.
   */
-static void P_RemoveLighting(sector_t *sector)
+void P_RemoveLighting(sector_t *sector)
 {
 	if (sector->lightingdata)
 	{

src/p_spec.c

@@ -7453,6 +7453,12 @@ static void P_ResetFakeFloorFader(ffloor_t *rover, fade_t *data, boolean finaliz
 					fadingdata->exactalpha);
 			rover->alpha = fadingdata->alpha;
 
+			if (fadingdata->dolighting)
+			{
+				P_RemoveLighting(&sectors[rover->secnum]);
+				&sectors[rover->secnum].lightlevel = rover->target->lightlevel; // \todo get fade light level destvalue
+			}
+
 			P_RemoveThinker(&fadingdata->thinker);
 		}
 
@@ -7729,6 +7735,13 @@ static void P_AddFakeFloorFader(ffloor_t *rover, size_t sectornum, size_t ffloor
 	// find any existing thinkers and remove them, then replace with new data
 	P_ResetFakeFloorFader(rover, d, false);
 
+	// Set a separate thinker for shadow fading
+	if (dolighting && !(rover->flags & FF_NOSHADE))
+		P_FadeLightBySector(&sectors[rover->secnum],
+			rover->target->lightlevel, // (shadowlight - targetlight) * destvalue/256 // \todo get fade light level destvalue
+			FixedFloor(FixedDiv(abs(d->destvalue - d->alpha), d->speed))/FRACUNIT,
+			true, exactalpha);
+
 	P_AddThinker(&d->thinker);
 }
 

src/p_spec.h

@@ -154,6 +154,8 @@ typedef struct
 #define FASTDARK 15
 #define SLOWDARK 35
 
+void P_RemoveLighting(sector_t *sector);
+
 void T_FireFlicker(fireflicker_t *flick);
 fireflicker_t *P_SpawnAdjustableFireFlicker(sector_t *minsector, sector_t *maxsector, INT32 length);
 void T_LightningFlash(lightflash_t *flash);