Ext vesion: 4.2.1
Sencha cmd version: 188.8.131.522
I generated a fresh theme package, "custom-theme," and changed its package.json to extend neptune. When I build and compare custom-theme's example / theme harness (build/example/theme.html) to the stock neptune example, custom-theme doesn't match up 1:1.
Specifically, the ".x-noborder-trbl" class isn't being applied to any panel body. This gives the same 1px border-style that's seen in ext-theme-classic/gray/etc. See below:
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