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In the 4.2 M1 build, there is a lot of flashing when you resize one of the CTabFolders on GTK. The underlying reason is that the new SashLayout is using the deferred layout mechanism to set the new bounds on the CTF and doesn't call update (in 3.x we used the Sash widget for layouts and it would call update).
*** Bug 386699 has been marked as a duplicate of this bug. ***
I cannot reproduce this issue on 4.8 M6, GTK3.22, and Fedora 27.
For Lars and to improve history: the reason you couldn't reproduce is that it was fixed with https://git.eclipse.org/c/platform/eclipse.platform.swt.git/commit/?id=497839c3b67213158842d7f6c52f267b111a379f