hopefully fix mapping stack III

provide neoforge with a version of custom_mappings.tiny from intermediary->named, instead of official->[intermediary, named]

build.gradle.kts

@@ -103,7 +103,9 @@ subprojects {
 		"mappings"(loom.layered {
 			officialMojangMappings { nameSyntheticMembers = false }
 			parchment(variantOf(libs.parchment) { artifactType("zip") })
-			if (project.path == ":common") { // neoforge likes to explode with these, and we only use them in common anyway
+			if (project.path == ":neoforge") {
+				mappings(rootProject.file("custom_mappings_stripped.tiny"))
+			} else {
 				mappings(rootProject.file("custom_mappings.tiny"))
 			}
 		})

custom_mappings_strip.py

@@ -0,0 +1,21 @@
+#!/bin/python3
+
+input_file = "custom_mappings.tiny"
+output_file = "custom_mappings_stripped.tiny"
+
+with open(input_file, "r") as f:
+    lines = f.readlines()
+
+with open(output_file, "w") as f:
+    for line in lines:
+        stripped = line.rstrip("\n")
+        leading_tabs = len(stripped) - len(stripped.lstrip("\t"))
+        parts = stripped.lstrip("\t").split("\t")
+
+        if len(parts) < 2:
+            f.write(line)
+            continue
+
+        # remove third-to-last column (i.e. 'official')
+        new_parts = parts[:-3] + parts[-2:]
+        f.write(("\t" * leading_tabs) + "\t".join(new_parts) + "\n")

custom_mappings_stripped.tiny

@@ -0,0 +1,75 @@
+tiny	2	0	intermediary	named
+c	net/minecraft/class_3572	net/minecraft/world/level/lighting/SkyLightEngine
+	m	(III)V	method_51590	updateSourcesInColumn
+		v	4	15	-1	_	minY
+	m	(IIII)V	method_51586	removeSourcesBelow
+		p	1		x
+		p	2		z
+		p	3		lowestSourceY
+		p	4		minY
+		v	5	13	-1	_	sectionX
+		v	6	19	-1	_	sectionZ
+		v	7	24	-1	_	topSolid
+		v	8	31	-1	_	sectionY
+		v	9	75	-1	_	minYInSection
+		v	10	82	-1	_	maxYInSection
+		v	11	91	-1	_	it_y
+		v	12	107	-1	_	it_pos
+	m	(IIII)V	method_51591	addSourcesAbove
+		p	1		x
+		p	2		z
+		p	3		lowestSourceY
+		p	4		minY
+		v	5	6	-1	_	sectionX
+		v	6	12	-1	_	sectionZ
+		v	7	63	-1	_	maxAdjacentLowestSourceY
+		v	8	71	-1	_	lowestRelevantY
+		v	9	85	-1	_	it_packedSection
+		v	11	125	-1	_	minYInSection
+		v	12	132	-1	_	maxYInSection
+		v	13	141	-1	_	it_y
+		v	14	157	-1	_	it_pos
+	m	(J)V	method_51529	checkNode
+		v	3	5	-1	_	x
+		v	4	11	-1	_	y
+		v	5	17	-1	_	z
+		v	6	23	-1	_	sectionPos
+		v	8	54	-1	_	lowestSourceY
+		v	9	100	-1	_	aboveLowest
+		v	10	137	-1	_	storedLightLevel
+	m	(JJI)V	method_51531	propagateIncrease
+		v	6	3	-1	_	blockState
+		v	7	10	-1	_	emptySectionsBelow
+		v	11	37	-1	_	direction
+		v	12	57	-1	_	targetPos
+		v	14	92	-1	_	storedLightLevel
+		v	15	98	-1	_	baseLevelToPropagate
+		v	16	128	-1	_	targetState
+		v	17	139	-1	_	trueLevelToPropagate
+	m	(Ldcd;)V	method_51471	propagateLightSources
+		v	2	12	-1	_	packedZeroPos
+		v	4	48	-1	_	sourcesO
+		v	5	74	-1	_	sourcesZN
+		v	6	100	-1	_	sourcesZP
+		v	7	126	-1	_	sourcesXN
+		v	8	152	-1	_	sourcesXP
+		v	9	165	-1	_	topSectionY
+		v	10	177	-1	_	bottomSectionY
+		v	11	186	-1	_	baseX
+		v	12	195	-1	_	baseZ
+		v	13	201	-1	_	sectionY
+		v	14	223	-1	_	packedSectionPos
+		v	16	237	-1	_	chunkNibbleArray
+		v	17	252	-1	_	sectionMinY
+		v	18	259	-1	_	sectionMaxY
+		v	19	262	-1	_	isMinBelowCurrent
+		v	20	265	-1	_	localZ
+		v	21	275	-1	_	localX
+		v	22	293	-1	_	minSourceY_O
+		v	23	333	-1	_	minSourceY_ZN
+		v	24	364	-1	_	minSourceY_ZP
+		v	25	394	-1	_	minSourceY_XN
+		v	26	425	-1	_	minSourceY_XP
+		v	27	444	-1	_	minSourceY_max
+		v	28	448	-1	_	it_y
+		v	29	507	-1	_	it_pos

gradle.properties

@@ -7,7 +7,7 @@ org.gradle.configureondemand=true
 org.gradle.configuration-cache=false
 # Loom
 fabric.loom.multiProjectOptimisation=true
-# it appears that this must be true to work with neoforge/arch loom
+# it appears that this must be false to work with neoforge/arch loom, but true for common/fabric
 fabric.loom.dropNonIntermediateRootMethods=true
 loom.ignoreDependencyLoomVersionValidation=true
 # Mod Metadata

neoforge/gradle.properties

@@ -1 +1,3 @@
 loom.platform=neoforge
+# it appears that this must be false to work with neoforge/arch loom
+fabric.loom.dropNonIntermediateRootMethods=false