Plugin Manager does not automatically download dependent plugins?

I have following problem.

When I install plugin (which depends on the other plugin as it is defined in plugin.xml file) from the IntelliJ IDEA Plugin Manager, its dependencies are not automatically installed.
Instead of that after IDEA restart there is a Plugin Error message: "Plugin <Plugin name> was not loaded: required plugin <Second plugin name> not installed."

Is it a correct behaviour or a defect?

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