Change to KTextEditor code completion interface

Hi,

I've recently removed the old completion provider interface in favour of a 
QAbstractItemModel - based code completion.  The new interface offers several 
advantages, including better handling for the user (no more unexpected 
keystroke consumption); user-controlled sorting, filtering, and grouping 
options; inbuilt and arbitrary syntax highlighting; etc.

Unfortunately in my porting I missed that Quanta was actually using the old 
interface.

I've started on porting Quanta to the new interface, but I have a few 
questions:

1) Invocation of code completion.
This is now handled in three ways: a) automatic invocation, when the user 
types specific text b) manual invocation, when the user types a shortcut, and 
c) 3rd party invocation, eg. if Quanta specifically requests a code 
completion to be shown.

Currently you're using your own system to provide invocation, which under the 
new scheme would be c).  However I'm guessing that you might be interested in 
using the inbuilt invocation now?  Currently it is implemented with regexps 
for finding the start and end of the range of text to be completed - the new 
code needs to know where the text to be completed against starts and 
finishes.  I was thinking of enabling completion models to supply their own 
regexps for detecting valid ranges of text to be completed, or even having a 
virtual function which can be called to provide this detection.

Here are the inbuild regexps as they stand at the moment: word 
start: "\b([_\w]+)$", word end: "^([_\w]*)\b".  I guess they might be a bit 
too programming-specific in comparison to what you need.

Alternatively you could stay with your current system and use option c), but 
that would limit the ability for other completion providers to peacefully 
coexist (not that I can really see a good use case for it, but...)

2) actually, it's just the invocation issue now :)

Let me know what you think...

Cheers,
Hamish.

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