Removing this environment variable from the startup script /usr/bin/eclipse fixes this - the thumb is drawn and usable.
export GDK_NATIVE_WINDOWS=true
Where possible I tested the problems listed in #443004 (and it's dupes) and they no longer seem to occur - I presume that the bug in GTK which provoked this workaround has been fixed.
Suggest removal of the workaround from the startup script
Here's the relevant excerpt from https:/ /bugs.launchpad .net/ubuntu/ +source/ eclipse/ +bug/779416 (#42 just gives the fix but left out source of fix and description of what was tested):
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Removing this environment variable from the startup script /usr/bin/eclipse fixes this - the thumb is drawn and usable.
export GDK_NATIVE_ WINDOWS= true
Where possible I tested the problems listed in #443004 (and it's dupes) and they no longer seem to occur - I presume that the bug in GTK which provoked this workaround has been fixed.
Suggest removal of the workaround from the startup script