bug#25946: 26.0.50; display-buffer ignores ignores reusable-frames in display-buffer-alist

[martin rudalics]

Can some kind soul please apply the attached patch to master?  The
commit message is


In `window--display-buffer' fix behavior reported in Bug#25946

* lisp/window.el (window--display-buffer): Set the dedicated
status of the window used and clear its history of previous
buffers also for the case that the window already shows the
buffer to be displayed.  (Bug#25946)


Many thanks in advance, martin

window.el.diff
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