set-editor in canvas:info-mixin

Sets the editor that is displayed by the canvas, releasing the current editor (if any). If the new editor already has an administrator that is not associated with a editor-canvas%, then the new editor is not installed into the canvas.

• (send a-canvas:info-mixin set-editor) -> void

  If redraw? is #f, then the editor is not immediately drawn; in this case, something must force a redraw later (e.g., a call to the on-paint method).

  If the canvas has a line count installed with set-line-count, the canvas's minimum height is adjusted.

  Calls update-info to update the frame's info panel.