[qtdeclarative] Fix preedit text layout

preeditPosition is relative to the block position
Merge pull request #38 from aaronkennedy/jb11811

[qtdeclarative] Fix preedit text layout
[qtdeclarative] Handle glyph runs with >65536 glyphs
Merge pull request #39 from aaronkennedy/jb9394

[qtdeclarative] Handle glyph runs with >65536 glyphs
Simple debug tracing.