Add Pinch to zoom text in conversation view
fixes #321 (closed)
This allows to increase/decrease font size in conversation view with a Pinch gesture. Font size also persist during restart.
in conversation view, first time show the feature demo.
To test: Pinch to zoom in the middle of the screen of the conversation view. Text size should increase or decrease ( only 4 level allowed ). It persist between restart
Edited by Lionel Duboeuf