D14408: SymbolView: Avoid unneeded update of current item

[loh tar]

loh.tar created this revision.
loh.tar added reviewers: Kate, sars.
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REVISION SUMMARY
    ...to reduce notably CPU use
    
    - Increase cursor update delay timer 100->200ms
    - Stop cursor delay timer when document is edited
    - Remember the item/symbol boundaries

TEST PLAN
  Compare CPU use with and without this patch.
  I have it done the dumb/PI*thumb way:
  
  - Start system activity and ensure its always visible
  - Set sorting to CPU use and keep and eye there
  - Open some file and move the cursor around, fast, semi fast, slower
  - Type something, fast, semi fast, slow, super slow
  - Watch espacially when you left some "Symbol Range"
  
  The next (little) patch will reduse the CPU use once more. Could perhapse sqashed with this one.

REPOSITORY
  R40 Kate

REVISION DETAIL
  https://phabricator.kde.org/D14408

AFFECTED FILES
  addons/symbolviewer/plugin_katesymbolviewer.cpp
  addons/symbolviewer/plugin_katesymbolviewer.h

To: loh.tar, #kate, sars
Cc: sars, kwrite-devel, #kate, michaelh, kevinapavew, ngraham, demsking, cullmann, dhaumann
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