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Details

Type: Bug
Resolution: Fixed
Priority: P1: Critical
Fix Version/s: None
Affects Version/s: 5.12.0, 5.12.1
Component/s: Quick: Core Declarative QML , Quick: Layouts
Labels:
None
Environment:
Fedora 28 64Bit / GCC 8.2.1
iPhone 8 / iOS 12.0 / ios SDK 12.1

Platform/s:

iOS/tvOS/watchOS, Linux/X11
Sprint:
Shovelling Snow

Description

In this example there is two Text items in a RowLayout. The RowLayout has the width of the window. The Text items are set to Layout.fillWidth: true and to wrapMode: Text.WrapAtWordBoundaryOrAnywhere. If you slowly change the width of the window at some point the UI will stop refreshing or the application crashes. Depending on the set text of the Text items.

I first ran into this problem on iOS by luck(no changing width of the window on iOS). But I could easily reproduce the issue on Linux and I think this can occure anywhere.

Example 1 - UI hangs:

RowLayout{
    width: parent.width
    Text{
        Layout.fillWidth: true
        text: "123456 12345678901234 123"   //- Case 1: Window freezes and never(?) updates again
        wrapMode: Text.WrapAtWordBoundaryOrAnywhere
    }
    Text{
        Layout.fillWidth: true
        text: "1234 12345678901234 123"     //- Case 1: Window freezes and never(?) updates again
        wrapMode: Text.WrapAtWordBoundaryOrAnywhere
    }
}

Example 2 - App crashes:

RowLayout{
    width: parent.width
    Text{
        Layout.fillWidth: true
        text: "OneWord"                     //- Case 2: App crashes
        wrapMode: Text.WrapAtWordBoundaryOrAnywhere
    }
    Text{
        Layout.fillWidth: true
        text: "OneWord"                     //- Case 2: App crashes
        wrapMode: Text.WrapAtWordBoundaryOrAnywhere
    }
}