Slic3r: 1.3.1-dev-54a31ee
OS: Ubuntu 18.04.4

Load STL
Select model.
Right click - Rotate - Around z axis...
Input 90 - press ok
Model moves 90 degrees counter clock wise as expected.
Input 90 - press ok
BUG Model doesn't move.
Input 0 - press ok
Model doesn't move. (As expected for relative rotations, but not absolute.)
Input -90 - press ok
BUG Model rotates 180 degrees.

Around x

Expected Behavior

As the slider is changed, show the value of the slider.

@gilboonet suggests "An option to show/hide slider value would be great."

Actual Behavior

The slider is shown but there's no display of the current value.

Steps to Reproduce the Problem

1. Open the example call "All Parameter Types"
2. There slider can be moved but there's not value displayed.

Add Runnable links of the code below the example.
Use link name Run Code which links to a Online C++ complier conatining the example code.
Use Rextester as the Online C++ Compiler (If you have a better suggesstion please comment).

Follow below steps to generate the Run Code Link.

1. Go to Rextester
2. Copy or write the example

Hello, it would be great if you could add some 3d text models. Thanks in advance :-)