Bug: Padding on StylableTextBox doesn't match default controls

[Nockiro]

Currently, the StylableTextBox's padding doesn't seem to match the default controls ones.

See the following comparison between the default (bottom) and the StylableTextBox (top):

[wolframhaussig]

@Nockiro Can you explain the differences or highlight them in the screenshot? I cannot really see a difference...

[Nockiro]

It is not easy to spot here, I agree. It becomes a bit more apparent if you look at a bigger version (here: 400%) of the screenshot: