Text annotations position is shifted (PR #342)

[r03ert0]

In the PR #342 (@dhovart),

Observed:
I enter a text annotation "corpus callosum" on top of a red scribble. When I change to full screen mode, the position of the text annotation is shifted.

Expected:
The expected behaviour is the one from brainbox.pasteur.fr: the annotation is in the same position fullscreen mode or not.

[denishov]

I've noticed the bug derives from a bug already present on main. When redimensioning the left pane, text annotations shift places as you drag along.
The vector layer needs to be scaled the same as the main canvas, for that a new development must be made.

[denishov]

Ignore previous comment, bugs were not related, I did not look into details even if a similar bug is present on main.