[Geany] Using Snippets

[Thomas Martitz]

So, after this mailing list made me aware of the super great snipped 
feature, I decided to get a bit into Geany hacking to expand the snipped 
featureset.

What my patch does is basically allow more than 1 cursor position and 
move to the next one using a hotkey. Little example:

for(i = 0; i < [cursor1]; i++)
{
    [cursor2]
}
[cursor3]

After doing for<tab>, the cursor ends up at cursor1, now you insert your 
text (e.g. MAX_COUNT), and hit ctrl+tab and move to cursor2, doing your 
stuff.

That saves a lot of movement with the arrow keys!
The snippet.conf syntax doesn't change, you're just going to add more 
%cursor%.

However, the current patch is far from intelligent and nice. It's a bit 
hackish (limited to 10 cursors, global struct in editor.c ...), and the 
next cursor movement is apparently broken once you hit tab normally 
between "jumps". To be investigated! Also, I changed the hotkey of "go 
to last used tab" to nothing, so that ctrl+tab is free for this (this is 
the best hotkey I can find for), feel free to discuss!

This being my first code contribution to Geany, I'd really like to get 
some feedback! Don't hit me if it's bad though ;)

PS: Geany is great :D
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