Bug 452249

SUMMARY
Configuring the pattern scale is quirky due to two reasons:
* The practical max range of the scale value is dependent on the size of the texture.  For example, the actual max scale for a 512x512 pattern is ~.40 while the actual max scale for a 20x20 pattern is ~10.0.
* Sliding the scale down to 0.00 seems to produce an unexpected visual of a significantly large-scaled texture that doesn't seem to be achievable with the current "true" ranges.

STEPS TO REPRODUCE
1. Select Basic 2 Opacity.
2. Enable Pattern option.
3. With 01_canvas.png (512x512) as the default pattern, observe the stroke at when the pattern scale is at 0.00 and when increasing it past .40.

OBSERVED RESULT
0.00 produces an unexpected result while going past .40 on the slider does nothing.

EXPECTED RESULT
Ideally there should be no invisible limit to the scale value besides what the slider designates. 0.00 shouldn't produce a largely scaled texture.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Debian sid
KDE Plasma Version: 5.24.3
KDE Frameworks Version: 5.90.0
Qt Version: 5.12.12 (appimage)

ADDITIONAL INFORMATION
This does not seem to be a regression.