Created attachment 6314 A minimal patch that fixes the bug. When not using the compositor, and cycling windows (with alt-tab), the wireframe that indicates which window is currently selected does not appear if the currently selected window has the same width and height as the previously selected window, which is not an uncommon situation.
Could you post a "git format-patch" instead, with your "signed-of-by" ?
Created attachment 6316 Fix wireframe visibility when cycling windows without compositor. Patch in git format-patch format with signed-off by line, as requested.
*** Bug 12125 has been marked as a duplicate of this bug. ***
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