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4.2 M5, EGit 1.3.0.201201270251 Some view toolbar buttons don't show tooltips in 4.2 (but works fine in 3.8). An example is the "Refresh" button in the "Git Repositories" view. The button is contributed via <menuContribution locationURI="toolbar:org.eclipse.egit.ui.RepositoriesView"> <command commandId="org.eclipse.egit.ui.RepositoriesViewRefresh" style="push"> </command> ... where the command doesn't have a "tooltip" attribute. In 3.8, the name of the command is used in that case, see CommandContributionItem#updateToolItem().
Fixed in master. Thanks for the bug report, Markus! http://git.eclipse.org/c/platform/eclipse.platform.ui.git/commit/?id=48126a25e5bd0ca343948731eee9a3cef00ad0f6
Verified with I20120312-1730 on Windows 7