Add extend to stacktrace and test results faces

It will fix broken rendering for emacs-27

Author: Roman Rudakov

cider-stacktrace.el

@@ -822,7 +822,7 @@ the NAME.  The whole group is prefixed by string INDENT."
           (cider-propertize-region '(detail 2)
             (insert "\n")
             (let ((beg (point))
-                  (bg `(:background ,cider-stacktrace-frames-background-color)))
+                  (bg `(:background ,cider-stacktrace-frames-background-color :extend t)))
               (dolist (frame stacktrace)
                 (cider-stacktrace-render-frame buffer frame))
               (overlay-put (make-overlay beg (point)) 'font-lock-face bg)))

cider-test.el

@@ -412,7 +412,7 @@ With the actual value, the outermost '(not ...)' s-expression is removed."
         (cider-propertize-region (cider-intern-keys (cdr test))
           (let ((beg (point))
                 (type-face (cider-test-type-simple-face type))
-                (bg `(:background ,cider-test-items-background-color)))
+                (bg `(:background ,cider-test-items-background-color :extend t)))
             (cider-insert (capitalize type) type-face nil " in ")
             (cider-insert var 'font-lock-function-name-face t)
             (when context  (cider-insert context 'font-lock-doc-face t))