QTable resize problem with large tables

[Robzzz]

I have a problem with large tables. My table has about 120000 rows. If I want to resize the table, it freezes. Is this a bug?
Has anybody else this problem?
Here is the example code:

table->setNumRows(120000); // still ok
table->setNumRows(6000); // freeze

table->setNumRows(120000); // still ok
table->setNumRows(6000); // freeze

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