Use of Tree line tracker in incremental mode

[angelozerr]

Fix #426

Signed-off-by: azerr [email protected]

[angelozerr]

When text changed, the TextDocument must update:

• the text content
• the line tracker which contains lines informations (length, offset of the line).

Before this PR, incremental mode used ListLineTracker which was recreated each time that text changed (compute of the all lines). This PR uses now TreeLineTracker to update line informations where text changed (kind of incremental mode for line informations computing).

To see the performance in action with tree line tracker, you can execute the TextDocumentUpdatePerformance . This test inserts a space in the nasa.xml in a loop.

• with tree line tracker it takes around 40 - 50 ms (with this PR)
• without tree line tracker (with listlinetracker which is created each time) it takes around 140 - 300 ms (you can start TextDocumentUpdatePerformance in the master by copying/pasting this class in the master).

The explanation of this improve of performance is that the update of line informations is done with a replace method in tree line tracker and although with list line tracker, it recomputes the whole lines each time.

[NikolasKomonen]

Works great for me. I really noticed the difference on a 100,000 line file.

Before auto closing tags wouldn't work, but its really fast now.

[angelozerr]

Before auto closing tags wouldn't work, but its really fast now.

Thanks @NikolasKomonen for your feedback!

@fbricon anything else? It should be very cool if this PR could be merged this night.

[fbricon]

I've pushed a small change to adjust the logging level with -Dlog.level in the server VM args, to minimize polluting the logs.
Now I'm ok to merge

[angelozerr]

Thanks guys for your review