Fix selectrum-insert-current-candidate error when history is ignored

CHANGELOG.md

@@ -89,6 +89,10 @@ The format is based on [Keep a Changelog].
   `completing-read-multiple` when `crm-separator` has a non default
   value. Previously it would replace the separator with commas when
   adding new candidates ([#140]).
+* `selectrum-insert-current-candidate` now works from
+  `selectrum-select-from-history` and other commands which ignore
+  history by setting `minibuffer-history-variable` to `t`. Previously
+  an error would be thrown.
 
 [#67]: https://github.com/raxod502/selectrum/issues/67
 [#82]: https://github.com/raxod502/selectrum/issues/82

selectrum.el

@@ -1140,7 +1140,8 @@ list). A null or non-positive ARG inserts the candidate corresponding to
                            selectrum--refined-candidates))
            (full (selectrum--get-full candidate)))
       (insert full)
-      (add-to-history minibuffer-history-variable full)
+      (unless (eq t minibuffer-history-variable)
+        (add-to-history minibuffer-history-variable full))
       (apply
        #'run-hook-with-args
        'selectrum-candidate-inserted-hook