[Bugs] #1709 IMME: Different color for block highlighting (running block vs. error highligting)

[Sugar Labs Bugs]

#1709: Different color for block highlighting (running block vs. error
highligting)
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    Reporter:  rgs          |          Owner:  walter                           
        Type:  enhancement  |         Status:  new                              
    Priority:  Immediate    |      Milestone:  Unspecified by Release Team      
   Component:  Turtleart    |        Version:  Git as of bugdate                
    Severity:  Unspecified  |       Keywords:  error handling highlighting block
Distribution:  Unspecified  |   Status_field:  Unconfirmed                      
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 To enhance visual feedback; it would be nice to have a different color for
 block highlighting depending on the case.

 Known cases where highlighting is used:

 1) to show running block

 2) when a syntax (or runtime) error is found, to show at which block the
 error was encountered (and the code path is shown by highlighting the
 calling blocks in the upper levels of the stack as well).

 Observations:

 <walterbender> rgs_: well... right now I precompute the highlight
 sprites... I suppose I could precompute a 3rd layer... but I worry about
 performance...

 One approach could be, in order to keep performance problems away, to
 precompute the highlighted blocks used to show the running block and to
 compute on the fly for the error-reporting case. This makes sense because
 performance is less important when doing error-reporting (then when
 running code).

 On the other hand, in the future we might want to expose a way to turn
 on/off highlighting (for the running and error-reporting case). But we
 should at least have 3 or 4 months of feedback from the field before
 taking the path of overloading the UI.

 Another consideration is what color to use for each case where
 highlighting is used. One option would be to infer the colors from your
 Sugar avatar. Another would be to have something static (i.e.: blue for
 the running block and red for the stacktrace when doing error-reporting).

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1709>
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