sw content controls: add rendering for the alias

- add a new SwFrameMenuButtonBase subclass to show the title/alias of
the content control under the cursor, if it's non-empty

- hide it when leaving the content control

- set its label to the alias from SwContentControl

- set the position similar to footer frame menu buttons, at the first
text portion of the content control

- make the label clickable and bind the handler to the content control
properties dialog

Change-Id: Ia35f0cc59c70910fb88719b207ef9e498d6760d3
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/141441
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Tested-by: Jenkins

0 files changed, 0 insertions, 0 deletions