FIX: MOLD/FLAT on MAP values does not remove line breaks

fixes: metaeducation/rebol-issues#2401

Author: Oldes

src/core/s-mold.c

@@ -841,6 +841,7 @@ STOID Mold_Map(REBVAL *value, REB_MOLD *mold, REBFLG molded)
 {
 	REBSER *mapser = VAL_SERIES(value);
 	REBVAL *val;
+	REBOOL indented = !GET_MOPT(mold, MOPT_INDENT);
 
 	// Prevent endless mold loop:
 	if (Find_Same_Block(MOLD_LOOP, value) > 0) {
@@ -858,15 +859,20 @@ STOID Mold_Map(REBVAL *value, REB_MOLD *mold, REBFLG molded)
 	mold->indent++;
 	for (val = BLK_HEAD(mapser); NOT_END(val) && NOT_END(val+1); val += 2) {
 		if (!IS_NONE(val+1)) {
-			if (molded) New_Indented_Line(mold);
+			if (molded) {
+				if(indented) 
+					New_Indented_Line(mold);
+				else if (val > BLK_HEAD(mapser))
+					Append_Byte(mold->series, ' ');
+			}
 			Emit(mold, "V V", val, val+1);
 			if (!molded) Append_Byte(mold->series, '\n');
 		}
 	}
 	mold->indent--;
 
 	if (molded) {
-		New_Indented_Line(mold);
+		if(indented) New_Indented_Line(mold);
 		Append_Byte(mold->series, ']');
 	}
 

src/tests/units/mold-test.r3

@@ -269,6 +269,31 @@ Rebol [
 
 ===end-group===
 
+===start-group=== "mold map!"
+	--test-- "mold map!"
+	m: make map! [
+		a: 1
+		b: 2
+		c: [
+			3 4
+		]
+	]
+
+	--assert (mold m) = {make map! [
+    a: 1
+    b: 2
+    c: [
+        3 4
+    ]
+]}
+
+	--test-- "mold/flat map!"
+	;@@ https://github.com/rebol/rebol-issues/issues/2401
+
+		--assert "make map! [a: 1 b: 2 c: [3 4]]" = mold/flat m
+
+===end-group===
+
 ===start-group=== "mold binary!"
 	bb: system/options/binary-base ;store original value
 	bin: #{FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF}