bind ctrl-r/alt-r to previous-item in fzf search

Bind the keys which may initiate an fzf-based reverse search to also
iterating upward through the matched items, once we are in fzf mode.

This makes fzf search more closely match the keyboard muscle memory of
traditional reverse incremental search (though it may look very
different visually).

Like #1278 this is intended to address

 * #1265 (comment)

This also assumes that alt-r from #1278 can initiate an fzf search.

Author: rolandwalker

changelog.md

@@ -1,6 +1,11 @@
 Upcoming Release (TBD)
 ======================
 
+Features
+--------
+* Make fzf search key bindings more compatible with traditional isearch.
+
+
 Internal
 --------
 

mycli/packages/toolkit/fzf.py

@@ -43,7 +43,7 @@ def search_history(event: KeyPressEvent):
 
         result = fzf.prompt(
             formatted_history_items,
-            fzf_options="--scheme=history --tiebreak=index --preview-window=down:wrap --preview=\"printf '%s' {}\"",
+            fzf_options="--scheme=history --tiebreak=index --bind ctrl-r:up,alt-r:up --preview-window=down:wrap --preview=\"printf '%s' {}\"",
         )
 
         if result: