https://bugs.kde.org/show_bug.cgi?id=413686

--- Comment #6 from Postix <pos...@posteo.eu> ---
I made some more observations

1) Use
>  kquitapp5 plasmashell && kstart5 plasmashell 
to reset the pager so everything looks fine

2) When the displayed label is changed to "text" and back to "number", the font
size of the number becomes bigger

3) There are several binding loops, here with two virtual desktops, so every
line appears twice:

>From "number" to "text":
/org.kde.plasma.pager/contents/ui/main.qml:177:9: QML Label: Possible anchor
loop detected on fill.
/org.kde.plasma.pager/contents/ui/main.qml:177:9: QML Label: Binding loop
detected for property "font.pixelSize"
/org.kde.plasma.pager/contents/ui/main.qml:177:9: QML Label: Possible anchor
loop detected on fill.
/org.kde.plasma.pager/contents/ui/main.qml:177:9: QML Label: Binding loop
detected for property "font.pixelSize"
/org.kde.plasma.pager/contents/ui/main.qml:190: TypeError: Cannot read property
'display' of null
/org.kde.plasma.pager/contents/ui/main.qml:190: TypeError: Cannot read property
'display' of null

>From "text" back to "number":
/org.kde.plasma.pager/contents/ui/main.qml:177:9: QML Label: Possible anchor
loop detected on fill.
/org.kde.plasma.pager/contents/ui/main.qml:177:9: QML Label: Binding loop
detected for property "font.pixelSize"
/org.kde.plasma.pager/contents/ui/main.qml:177:9: QML Label: Possible anchor
loop detected on fill.
/org.kde.plasma.pager/contents/ui/main.qml:177:9: QML Label: Binding loop
detected for property "font.pixelSize"

>From "number" to "none":
/org.kde.plasma.pager/contents/ui/main.qml:190: TypeError: Cannot read property
'display' of null
/org.kde.plasma.pager/contents/ui/main.qml:190: TypeError: Cannot read property
'display' of null


The issue is somewhere here:
https://github.com/KDE/plasma-desktop/blob/Plasma/5.17/applets/pager/package/contents/ui/main.qml#L190

If I set `font.pixelSize` to a fixed value like 8 or 20, the label is always
correctly positioned and I no longer receive the both erros:
> Possible anchor loop detected on fill.
> Binding loop detected for property

but only 
> Cannot read property 'display' of null
remains.

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