Fix missing text when the input selected again and type new text

[baochungit]

Checking on mobile (Android), for Vietnamese keyboard, when typing without pressing space bar, the typed text is all marked text and not updated to the self.value variable (when pressing space, the marked text will be dropped and replaced by a normal text). This leads to missing the typed text when the input selected again and type new text

[Insality]

Thanks for your contribution! Will check everything and push this into next update of Druid