fix(autosize): properly detect line-height in firefox #6190
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In Firefox it happens that textarea elements are always bigger than the specified amount of rows. This is because Firefox tries to add extra space for the horizontal scrollbar.
As a workaround that removes the extra space for the scrollbar, we can just set overflow to hidden. This ensures that there is no invalid calculation of the line height.
See Firefox bug report: https://bugzilla.mozilla.org/show_bug.cgi?id=33654
Fixes #6179