v0.6.3

mdedit 0.6.3

- Tabs side by side. Split the window with View → Split Right
  (Ctrl/Cmd+\), Split Right on a tab's right-click menu, or by dragging a
  tab onto the right or left half of the document. Each side has its own
  tab strip; drag tabs between strips or along one to reorder, or onto the
  other side's document to move them there. Once split the command reads
  Move to Left / Right Side, and Join Sides puts everything back.
- The divider between the sides is adjustable: drag it anywhere from 20% to
  80% of the width, double-click it to make the sides equal.
- The side you are not typing in shows its document as you left it, and
  scrolls on its own. Click anywhere on it to edit there, with the caret
  where you clicked.
- Mermaid diagrams are drawn by Pele 1.8.0, covering every diagram type in
  Mermaid 12.1, themed to the editor's light and dark palettes. Gantt
  charts draw their "today" line again, and a diagram that fails to parse
  says which line.