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Bug 1582410 Comment 0 Edit History
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The message compose window editing commands aren't doing things in a very webby way a the moment. Things like cmd_fontFace do a funny little roundtrip through c++, when all that really should be needed is something like editor.document.execCommand We should convert these over to document.execCommand commands. See https://developer.mozilla.org/en-US/docs/Web/API/Document/execCommand and also https://codepen.io/chrisdavidmills/full/gzYjag/ doStatefulCommand is also now called for every keypress in the editor (due to observing document changed I think), which can't be very great for performance.