Changing text justification after puting it on a path works strangely
#### Summary:
If you place some text along a path and try changing justification afterward - the text justification point is fixed to a path's initial anchoring point. Changing justification prior to Text on a Path operation work, though.
#### Steps to reproduce:
- open Inkscape
- write some text
- draw some path (2-point straight line)
a) put text on the path and change text justification
b) change text justification and put text on the path
#### What happened?
Look at the provided example.
#### What should have happened?
A bit more predictability...
Sample attachments:

#### Version Info:
```
- Inkscape Version: master
- Operating System: Linux
- Operating System version: Manjaro
```
issue