the preview pane had its own min-height (min-h-40, or min-h-24 from the comment editor) while the write tab took the textarea's, so toggling tabs resized the whole editor. the pane now takes the field's own height and inset from the exported textareaMinHeight, which leaves nothing to drift, and previewClass — which only existed to set that height — is gone. measured on the editor and reply stories: both tabs render a 256px pane at the same offset. Signed-off-by: eti <eti@eti.tf>