toggling password generator 'advanced' mode off sometimes does not shink dialog size

[jnqnfe]

While playing with things to help understand #5300, I've noticed that when toggling the password generator advanced mode on/off, sometimes when changing to off, the dialog is not shrunk in size, remaining at 'advanced' size.

It's proving impossible to determine any specific pattern to reliably reproduce it, but happens about 50% of the time, and seems more likely to happen if you delay toggling off by moving the cursor around a little first.

I'm using version 2.6.1 on Debian, with a HiDPI screen (scaling 200%). Qt 5.14.2.

[droidmonkey]

It's a Qt problem and won't be fixed. Tried to make it more reliable already.

[jnqnfe]

Ok.