QML text editors need to allow preedit committing on mouse events outside preedit

Meego text input style uses preedit for text input with word correction. The preedit is specified to be committed when user relocates the cursor elsewhere. Currently this does not happen and neither is possible to made happen by meego text input.

QML elements need to either:

• automatically commit preedit when cursor position is changed, or
• call QInputContext::reset() and accepting QInputMethodEvent with commit string that might result, or
• provide some other means for input context to be allowed to commit text.