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Found while testing 4.2.2 build M20130116-1800 that some of the tooltips on toolbar items are not appearing. Interestingly this is not happening uniformly to all toolitems. I was able to reproduce this with a fresh workspace as well as using an existing workspace. I'm not sure if this would be easily reproducible on a different machine but I noticed that within a single toolbar itself, some tooitems are showing tooltips while some are not. I was testing on Ubuntu 12.04 x86_64.
I see this on RHEL6 as well.
The problem only happens when a toolbar is re-parented. It is caused by the changes for bug#391722. We need to back port this. Fixed in master (4.3): http://git.eclipse.org/c/platform/eclipse.platform.swt.git/commit?id=fbb292af69fce7799a14de7c3256ae3196bbbc23
Back ported to R4_2_maintenance and R3_8_maintenance http://git.eclipse.org/c/platform/eclipse.platform.swt.git/commit/?h=R3_8_maintenance&id=834f38ced80683bacf34828c2ccadca8ed78482a http://git.eclipse.org/c/platform/eclipse.platform.swt.git/commit/?h=R4_2_maintenance&id=d5aa4f0877c2248deb584eaf6e5d0734a76a6381