Tab completion should indicate suggested completion without using textbox's selection

[spoulson]

Currently, tab completion will indicate its suggestion by inserting it in the text field and using selection to select the text. The user can press Enter or continue typing to accept the suggestion, Tab to try the next suggestion, or Esc to reject autocompletion.

The problem is that the functionality is trying to override default handling of selected text. This presents a variety of minor usability issues.

To keep things simple, tab completion should be done without text selection. Instead, use a tooltip-like popup.

[spoulson]

Fixed for autoreply completion. Temporarily disabled autocompetion of nicks for upcoming refactoring using tooltip approach. 3629e572790086bd524642006f92dc828af03ea7

[spoulson]

Rewrote autocomplete suggestion functionality. 5c2bf420a82bffa3e3e7b532009340717a101a33

[spoulson]

Append ": " on accepting a nick at beginning of the line.

Issue: Autocomplete tooltip remains after pressing enter while a suggestion was presented.

Issue: Pressing tab quickly after typing initiates a scan, when the user wants to accept first autocomplete. Instead:

• Tab will initiate a scan and place first suggestion inline in editor.
• The tooltip will appear showing all suggestions with an indicator on the current inlined suggestion.
• Press Escape to reject suggestion and inline suggestion is replaced with original text.
• Successive tabs will cycle through the suggestions inline in the editor.
• User accepts the suggestion by typing anything else or pressing Enter. The tooltip is then closed.

[spoulson]

fd2cb2d0bf0e1cc3c04a05cf5c0b5f7c5d7ff4bf