MUI_PAGE_CUSTOMFUNCTION_PRE of customPageAfterChangeDir conflict

[Yueyanc]

• Electron-Builder Version:
  24.13.3

• Node Version:
  Does not matter

• Electron Version:
• Does not matter
• Electron Type (current, beta, nightly):
• Does not matter

• Target:

!ifdef allowToChangeInstallationDirectory
    !include StrContains.nsh

    !insertmacro skipPageIfUpdated
    !insertmacro MUI_PAGE_DIRECTORY

    # pageDirectory leave doesn't work (it seems because $INSTDIR is set after custom leave function)
    # so, we use instfiles pre
    !define MUI_PAGE_CUSTOMFUNCTION_PRE instFilesPre

    # sanitize the MUI_PAGE_DIRECTORY result to make sure it has a application name sub-folder
    Function instFilesPre
      ${StrContains} $0 "${APP_FILENAME}" $INSTDIR
      ${If} $0 == ""
        StrCpy $INSTDIR "$INSTDIR\${APP_FILENAME}"
      ${endIf}
    FunctionEnd
  !endif

  # after change installation directory and before install start, you can show custom page here.
  !ifmacrodef customPageAfterChangeDir
    !insertmacro customPageAfterChangeDir
  !endif

  !insertmacro MUI_PAGE_INSTFILES

MUI_PAGE_CUSTOMFUNCTION_PRE cannot be defined in customPageAfterChangeDir

!macro customPageAfterChangeDir
  !define MUI_PAGE_CUSTOMFUNCTION_PRE XXXX
  !insertmacro MUI_PAGE_DIRECTORY
!macroend customPageAfterChangeDir

The error MUI_PAGE_CUSTOMFUNCTION_PRE is already defined

[Yueyanc]

How do I ensure that customPageAfterChangeDir only appears during installation and is hidden during update