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There are long objects paths showed during installation. In this case all page components including progress bar goes up on the panel, then goes back down. Such behavior makes panel view ugly and looks like annoying flicker. This issue is highly visible, so P2. There are two parts on the screenshot - normal panel view at left and all staff one pixel up at right.
Created attachment 38719 [details] screenshot
Just a note that can probably help to find the core of the issue. This issue is reproducible only in the normal (installation) mode and not reproducible in create-bundle mode.
I changed OS to All because issue confirmed at least on Solaris x86. I think other platforms affected also.
*** Issue 101925 has been marked as a duplicate of this issue. ***
This is caused by a bug in GridBagLayout. We switched to BorderLayout for the wizard frame container, and the issue seems fixed. -> FIXED
*** Issue 102097 has been marked as a duplicate of this issue. ***
Great.