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Created attachment 281801 [details] Test case I am having an issue where TreeEditors are displaying over the Tree's scroll bars. For the horizontal scroll bar, this occurs both with the overlaid scroll bar (where the scroll bar only displays when you mouse over it) and for the permanent scroll bars (permanent when there is enough in the tree for scrolling to be needed, that is). For the vertical scroll bar, it only occurs for the overlaid scroll bars. Here is my environment: OS: centos-release-7-7.1908.0.el7.centos.x86_64 GTK: 3.22.30 Desktop environment: GNOME 3.28.2 Eclipse: 4.12.0.I20190605-1800 This has the overlaid scroll bars by default, but I set GTK_OVERLAY_SCROLLING to 0 to get the permanent scroll bars. I can also repeat this for the horizontal scroll bar on MATE, since that has the permanent scroll bars by default. See attached test case. You may need to resize the dialog some to get the scroll bars to display.
Note that the test case puts Combos in the TreeEditor, but I also can repeat the issue with other controls like Canvases or Labels with non-transparent backgrounds.
Created attachment 281803 [details] Overlaid vertical scroll bar covered
Created attachment 281804 [details] Permanent horizontal scroll bar covered
Issue is still present in 4.16
