Number of rows slider not the same width as other sliders

Submitted by Yousuf Philips @philipzae

Assigned to Xfce Bug Triage

Link to original bug (#15656)

Description

Created attachment 8704 screenshot with red highlighted area

Steps:

1. open panel properties
2. change sliders in Measurements section to their lowest numbers
3. notice the 'Number of rows' slider and slider value label are not aligned with the other 2

Changing the nrows GtkAdjustment from maximum 6 to 100 fixes the visual issue, but this isnt a correct solution.

Tested on Xubuntu 19.10 Daily

Attachment 8704, "screenshot with red highlighted area":

Version: 4.13.5