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QT Combobox flickers when updating items list

Original Reporter info from Mantis: JuhaManninen @JuhaManninen
  • Reporter name: Juha Manninen

Description:

QT bindings version of TCombobox changes its visual text when a program adds items to its list. The list is not visible at that moment and it should not show to user.

This is a real life problem with Lazarus Object Inspector. ValueCombobox is updated every time it gets focus. It causes annoying flicker and makes it slow.
My patch "0015883: Object Inspector updates ValueComboBox control many times"
makes it little faster but this QT problem has a still bigger effect.

I attach a demo program. Click the different comboboxes and you see what I mean.

Mantis conversion info:

  • Mantis ID: 15885
  • Version: 0.9.29 (SVN)
  • Fixed in revision: 23861 (#a266017f),24062 (#b3eed82c)
  • Monitored by: » luizamerico (Luiz Americo)