Flameshot version

$ flameshot --version
Flameshot v0.6.0
Compiled with Qt 5.14.1

Describe the bug

When using the following format for saving screenshots

$ flameshot config -f %Y_%m_%e__%H_%M_%S

Days are expected to be two digits, a space is used when a day is printed with one digit (see below)

$ ls -A1 ~/Pictures/ss
2020_04_30__12_16_26.png
20

When the foreground color is changed in the document (selected from the color palette), the color doesn't automatically update. Instead, you have to change the airbrush pattern(select a different spray size) to make the change in color happen. The issue is that I can't move the color change "function" into any of the canvas event handlers (just doesn't show anything).