I set my editor use the whitespace only, but I got problem with the whitespace’s width. The longer whitespace in blank lines, shorter in others. I have no idea how to configure it.

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You are using a variable width font. Change it to a fixed width font like Courier New/Consolas/Monaco/Menlo (depending on your preferences)
Go to Eclipse->Preferences->General->Appearance->Colors and Fonts->Structured Text Editors->Structured Text Editor font and set it to a fixed width font