When I select a text in order to change header style, the text is deleted.
See screencast: http://screencast.com/t/7ETeXI6z
Allow to transform paragraph into heading and heading into paragraph
hum not sure to understand this one either. But this is a typical case where a screencast would help. Can you record one and put a link here ?
That's clear. This is issue is then about hidding the "+" button when there's a selection. Adding "Paragraph" in the style list will be handled in EZP-25348.
Setting fix version as 1.7rc1 as we should try to fix that for the 1.7.0
PR approved by QA
Fixed into 1.6 and master (1.7) in https://github.com/ezsystems/PlatformUIBundle/commit/e7d80671a7d876c24c2e5da0b40bb37c94801941