Unloading a secondary project doesn't release memory

Values are provided by Process Explorer. All the values are after C++ parsing is done.

• Initial Private Bytes value -> 142MB
• Opened project 1 (qmake) -> 310MB
• Closed project 1 -> 200MB
• Opened project 1 -> 320MB
• Opened project 2 (qbs) -> 750MB
• Closed project 2 -> No change
• Opened project 2 -> 880MB
• Closed project 2 -> No change
• Closed project 1 -> 450MB

When the qbs project alone is opened:

• Opened project 2 -> 660MB
• Closed project 2 -> 240MB