Fix client-side terminal alt-buffer detection #1726
Merged
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Broken by update to xterm.js 2.9.2 internals, which I took late in 1.1 cycle. So close to getting away with it relatively unscathed! :-(
Resolves #1725
Regression caused Ctrl+L to clear entire terminal even when running a full-screen program such as tmux, which does its own handling of Ctrl+L to clear the current pane, instead. Essentially, Ctrl+L messes up full-screen programs and prevents them from doing what they want with Ctrl+L.
Also messed up which commands display in upper-right of Terminal toolbar (stop and clear should be hidden when running full-screen program, but they aren't).