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Type: Bug
Resolution: Fixed
Priority: P3: Somewhat important
Fix Version/s: 6.4.3, 6.5.0, 6.6.0
Affects Version/s: 5.10.1, 5.12.3
Component/s: Quick: Dialogs
Labels:
None

Platform/s:

Windows
Commits:
de704b633 (dev), c662fb0be (6.5), b75ab7662 (6.4)

Sample code:

  Button {
    id: filtersButton
    property bool flag: true
    anchors.centerIn: parent
    text: flag ? "PNG (*.png)" : "JPEG (*.jpg)"
    onClicked: flag = !flag
  }

  Button {
    id: openButton
    anchors.horizontalCenter: filtersButton.horizontalCenter
    anchors.top: filtersButton.bottom
    anchors.topMargin: 16
    text: "Open"
    onClicked: fileDialog.visible = true
  }

  FileDialog {
    id: fileDialog
    nameFilters: filtersButton.text
  }

Steps to reproduce:
1. Click openButton to open file dialog.
QWindowsNativeFileDialogBase::setNameFilters will be called, which will set m_nameFilters.
2. Close file dialog.
3. Click filtersButton to swap filters.
QWindowsNativeFileDialogBase::selectNameFilter will be called. It will try to find index of a new filter in m_nameFilters. But it fails because m_nameFilters still contains old list of filters, since it is updated only on the dialog open. This produce two similar messages in console:

QWindowsNativeFileDialogBase::selectNameFilter: Invalid parameter 'JPEG (*.jpg)' not found in 'PNG (*.png)'.
QWindowsNativeFileDialogBase::selectNameFilter: Invalid parameter 'JPEG (*.jpg)' not found in 'PNG (*.png)'.