2

First, instead of the code you're using to customize face helm-selection, just use M-x customize-face, and save your changes. Using Customize is nearly always a better idea. To your question: Put your cursor on the text whose face you want to know, e.g. the face you say is "green and purple", and use C-u C-x =. The *Help* buffer will tell you (...


2

Adding this to your config should work the way you want, which BTW is the normal way to add font-lock keywords. (font-lock-add-keywords 'shell-mode '(("alias" . font-lock-builtin-face)))


1

Put your cursor on a char with that gray foreground, and use C-u C-x =. The *Help* tells you (near the bottom) what face(s) are used there. Then use M-x customize-face to customize the face(s) to be as you like.


1

Following @lawlist advise, using :box attribute for mode-line-inactive made it. The mode lines images shown in the question are from inactive frames. The second image shows an inactive frame with a mode line that does not render the straight lines. Using: (set-face-attribute 'mode-line-inactive nil :box t) renders the straight line with foreground color: ...


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