[Patch] fixlet for caretPositionChanged insanity

[Leo Savernik]

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Hello,

This patch fixes the emission of the caretPositionChanged signal for each 
mouse move (which is a big waste of cycles because the caretPositionChanged 
is emitted in the mouseRelease handler anyway).

Then it also improves the caret position recalculation only to be done if it 
is needed (i. e. the caret is visible).

Nicolas, could you try the patch and tell me if it breaks selection in kafka? 
Maybe kafka relies on caretPositionChanged during mouseMove (it seemed to 
work for me when I tested it).

Ok to commit?

mfg
	Leo
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