When live-preview is enabled on Markdown file, the Soft-wrap button break the layout
In the Source Editor, when editing a Markdown file and the :source_editor_toolbar
flag is enabled, the editor's toolbar is available. If one enables the Live Preview, the editor's view gets split in half to accommodate the preview. If, in this state, the soft-wrap button is clicked, it breaks the split in the editor with every new click on the soft-wrap button.