Cannot drag value with inline Float operator (and a few others)

Steps to reproduce:

1. Create a VFX Graph

2. Add a Float operator

3. Try to change the value by dragging the empty area on the left of the input field

Actual results: 
We can't grab the "invisible label" to change the value
Expected results: 
An invisible label should be draggable to change the value

Reproducible with versions: 
6000.0.10f1
Not reproducible with versions: 

Can’t test with versions: 

Tested on (OS): 

Notes:

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