Term selection and reference highlighting on different sequents.

[SpringVaS]

Term selection and reference highlighting in the displayed sequent is stored in a way that it is applied on any sequent that is selected. Also the reference highlighting in the editor is not cleared. This leads to inconsistent displays.

[JonasKlamroth]

@SpringVaS can you check whether or not not #188 is resolving this?

[SpringVaS]

Unfortunately, it does not.

[SpringVaS]

Furthermore, the variable is sometimes highlighted at the wrong position. As in the following picture.