Take mode-line-right-align-edge into account

[angrybacon]

Expected behavior

Use mode-line-format-right-align (Emacs 30.0.50) in my mode-line and have the right segments aligned to the appropriate offset, depending on mode-line-right-align-edge value.

Actual behavior

The right segments are off-screen.

Steps to reproduce

• (setq mode-line-format '("Left" mode-line-format-right-align "Right"))
• (centered-window-mode 1)

Furthermore if customizing mode-line-right-align-edge with the 'right-margin value, the right segments are now aligned to the right edge of the window rather than the right margin. It seems this mode and olivetti with which I don't reproduce the issue use different parts of the frame to create spacing around content (fringes vs. margins perhaps?)

Versions of centered-window-mode, Emacs, OS etc.

• centered-window-mode: 80965f6
• Emacs: 30.0.50
• OS: Arch and macOS