nimpretty: don't touch dense binary operators

compiler/layouter.nim

@@ -104,7 +104,7 @@ proc softLinebreak(em: var Emitter, lit: string) =
 proc emitTok*(em: var Emitter; L: TLexer; tok: TToken) =
 
   template endsInWhite(em): bool =
-    em.content.len > 0 and em.content[em.content.high] in {' ', '\L'}
+    em.content.len == 0 or em.content[em.content.high] in {' ', '\L'}
   template endsInAlpha(em): bool =
     em.content.len > 0 and em.content[em.content.high] in SymChars+{'_'}
 
@@ -203,6 +203,10 @@ proc emitTok*(em: var Emitter; L: TLexer; tok: TToken) =
     wr(TokTypeToStr[tok.tokType])
     wr(" ")
   of tkOpr, tkDotDot:
+    if tok.strongSpaceA == 0 and tok.strongSpaceB == 0:
+      # if not surrounded by whitespace, don't produce any whitespace either:
+      wr(tok.ident.s)
+    else:
       if not em.endsInWhite: wr(" ")
       wr(tok.ident.s)
       template isUnary(tok): bool =