autocomplete requires too many tabs

[vogler]

Description

For files foo.{a,b} (but also foo_{a,b} etc.)

v fo<TAB>

completes to

v foo.

but shows no file menu to make clear that the completion is not done.
Sometimes hitting <TAB><CR> is enough to edit a file and sometimes <TAB><TAB><TAB><CR> is needed, depending on the context (e.g. is there a .h file for a .c file).
An alternative would be to complete the most frequently/recently used suffix instead.
But at least it should already show the completion menu to indicate that there is a choice to be made - currently this requires another <TAB>.
To get from fo to foo.a you even have to do fo<TAB><TAB><TAB> since the first result is not selected.

I don't know if this can be done inside prezto or if it's a zsh issue.

Expected behavior

fo<TAB> completes to foo. and opens the completion results. Another <TAB> selects the first result.

Alternative:
fo<TAB> completes to foo.a and opens the completion results.
This means we can't complete to the longest common prefix anymore.
Maybe hitting <BS> could be used to shorten the completion to that longest common prefix.

Versions

• Prezto commit: e94b6b2
• ZSH version: zsh 5.7.1 (x86_64-apple-darwin18.2.0)
• OS information: macOS 10.14.5 (18F132)

[vogler]

After reading http://zsh.sourceforge.net/Doc/Release/Completion-System.html I arrived at the following:

Alternative 1:

setopt menu_complete

v fo<TAB> -> v foo.a with open menu with foo.a selected (<TAB> cycles), <CR> accepts completion, <CR> executes command.
^O accepts completion and executes command.

Alternative 2:

zstyle ':completion:*:default' menu 'yes' 'search'

v fo<TAB> -> v foo.a with interactive search prompt (typing b will select foo.b, <TAB> cycles through results), <CR> ends isearch, <CR> accepts completion, <CR> executes command.
^O accepts completion and executes command.

Optional:

#  sort file completions by last access time (most recent first)
zstyle ':completion:*' file-sort access
# highlight the first ambiguous character in completion lists
zstyle ':completion:*' show-ambiguity 'true'
# make ctrl-j also accept completion and execute command, enter or space can still be used to accept w/o execution
bindkey -M menuselect '^J' .accept-line

I don't know if that's a better default (for me it certainly is). Sadly I didn't find an option to just show the menu w/o completing.
I'll leave this open for now in case someone has better ideas. Feel free to close.

[vogler]

I can't find a place to put bindkey -M menuselect '^J' .accept-line. Both in zshrc and zpreztorc I get no such keymap 'menuselect'.
If I leave off -M menuselect or try -M main it doesn't complain, but it also doesn't work (bindkey-all only lists .accept-line in a keymap .safe, but that's coming from somewhere else).