Main query box does not have horizontal scroll in firefox

[carlosms]

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[carlosms]

Issue left open as requested by @smacker here https://github.com/src-d/gitbase-playground/pull/154#pullrequestreview-132881672.

copy & paste of the conversation:

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There is, however, a problem I'm not able to fix. The horizontal scroll on firefox covers half of the last line. This does not happen if CodeMirror lineNumbers is enabled. It might be related to https://github.com/codemirror/CodeMirror/issues/3821.

Chrome on top, firefox below it:

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hm. Looks like the issue in code-mirror was fixed: https://github.com/codemirror/CodeMirror/commit/3316d3589dbbeed21e0316855897a341ffd3a933#commitcomment-16278388

let's merge it but keep issue open

[smacker]

also there is no bug on MacOs (due to the way it displays scrollbars)