In Progress
Steps to reproduce:
- Open "CAS" view
- In cell 1, type "f(x):=0.5*x"
- Hit [Enter]
It should now look like this:
Now, do the following:
- Select the light-blue part of cell 1
- Click on the "Keep Input" button
This way, the previously defined function gets deleted and instead, you get the following:
The same problem 
Thanks, nice bug report :)
We'll check (sorry, probably not soon though)
Actually, the same problem occurs when first evaluating numerically and then switching back to exact evaluation. So it seems not like a problem of the "Keep Input" button, but more like a deeper problem of the select-and-click method.
To be honest, the whole concept of the CAS windows seems more like a point-and-click adventure to me than a productively usable "real" CAS.
I already noticed that there actually are useful key combinations (e.g. [Alt]+[Enter] for keep-input), but right now they produce extra unnecessary lines which make the result ugly. Sadly, this suggestion (as many other useful suggestions I already made) was rejected.
Hopefully, the current decision-makers will sooner or later stop being to stubborn and immune to useful improvements.
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