umputun / revdiff / 29380689180

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fix(themes): detect terminal background inside tmux for --theme auto

termenv refuses to send OSC status-report queries when TERM starts with tmux or screen, so --theme auto always fell back to the dark theme inside tmux regardless of the actual terminal background. Detection now runs two tmux-aware paths before giving up: ask tmux for the attached client's reported theme via 'tmux display-message -p #{client_theme}' (tmux >= 3.5, needs no tty, works inside display-popup panes where tmux does not answer OSC 11), then retry termenv's OSC 11 query with TERM masked as xterm-256color (tmux answers it in regular panes with the outer terminal's current background). Outside tmux behavior is unchanged, and if both paths fail the old COLORFGBG / dark-default fallback still applies.

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