Add dock button to keep description pane open #1856
Merged
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This PR aims at fixing this issue.
It is done by adding a button to keep the description pane of an image entry open:

If this button is on, then the description pane will stay visible, even if the selected image entry doesn't have any description.
A preference was added to save the button status when QuPath restarts.
An edit button was also added to easily edit the description. It is only shown when an image is currently selected.
The caret in the description pane is not visible anymore.