void setIfTrue(SFormsFastMapDirect ifTrue) {
    if (this.ifTrue != ifTrue && this.ifFalse == null) {
      // make sure we don't override getIfFalse()
      this.ifFalse = this.ifTrue;
    } else if (this.ifFalse == ifTrue) {
      this.ifFalse = null; // go back to normal state
    }

    this.ifTrue = ifTrue;
  }
Sets the "ifTrue" variable map to the given map.
src/org/jetbrains/java/decompiler/modules/decompiler/sforms/VarMapHolder.java