[Run dialog] When completion is not unique, show list of possible completions
[Run dialog] Make "show completion list" optional
[Run dialog] Cleanup, fixes and optimizations for listing completions
[Run dialog] Don't show completions if less than 3 characters are present
[Run dialog] Fix broken key
[Run dialog] Escape space characters in completion
Merge pull request #1584 from dalcde/alt-f2-suggest

[Run dialog] When completion is not unique, show list of possible completions