flowchart: left directed arrow ⟵ (edges) is missing; is it possible to include, Thanks.

[sobdev82]

I had this issue now multiple time that I needed an left directed arrow (⟵) . I wanted to ask if possible to include it.

I've did a short research in you source code.
I think to place to change is in mermaid/packages/mermaid/src/diagrams/flowchart/parser/flow-edges.spec.js
and the change would be:

  const regularEdges = [
  { edgeStart: '--', edgeEnd: '--x', stroke: 'normal', type: 'arrow_cross' },
  { edgeStart: '==', edgeEnd: '==x', stroke: 'thick', type: 'arrow_cross' },
  { edgeStart: '-.', edgeEnd: '.-x', stroke: 'dotted', type: 'arrow_cross' },
  { edgeStart: '--', edgeEnd: '--o', stroke: 'normal', type: 'arrow_circle' },
  { edgeStart: '==', edgeEnd: '==o', stroke: 'thick', type: 'arrow_circle' },
  { edgeStart: '-.', edgeEnd: '.-o', stroke: 'dotted', type: 'arrow_circle' },
  { edgeStart: '--', edgeEnd: '-->', stroke: 'normal', type: 'arrow_point' },
  { edgeStart: '==', edgeEnd: '==>', stroke: 'thick', type: 'arrow_point' },
  { edgeStart: '-.', edgeEnd: '.->', stroke: 'dotted', type: 'arrow_point' },

  { edgeStart: '--', edgeEnd: '----x', stroke: 'normal', type: 'arrow_cross' },
  { edgeStart: '==', edgeEnd: '====x', stroke: 'thick', type: 'arrow_cross' },
  { edgeStart: '-.', edgeEnd: '...-x', stroke: 'dotted', type: 'arrow_cross' },
  { edgeStart: '--', edgeEnd: '----o', stroke: 'normal', type: 'arrow_circle' },
  { edgeStart: '==', edgeEnd: '====o', stroke: 'thick', type: 'arrow_circle' },
  { edgeStart: '-.', edgeEnd: '...-o', stroke: 'dotted', type: 'arrow_circle' },
  { edgeStart: '--', edgeEnd: '---->', stroke: 'normal', type: 'arrow_point' },
  { edgeStart: '==', edgeEnd: '====>', stroke: 'thick', type: 'arrow_point' },
  { edgeStart: '-.', edgeEnd: '...->', stroke: 'dotted', type: 'arrow_point' },
  
  // NEW: left directed Edges -------------------------------------------------------------------------------------------
  { edgeStart: 'x--', edgeEnd: '--', stroke: 'normal', type: 'arrow_cross' },
  { edgeStart: 'x==', edgeEnd: '==', stroke: 'thick', type: 'arrow_cross' },
  { edgeStart: 'x-.', edgeEnd: '.-', stroke: 'dotted', type: 'arrow_cross' },
  { edgeStart: 'o--', edgeEnd: '--', stroke: 'normal', type: 'arrow_circle' },
  { edgeStart: 'o==', edgeEnd: '==', stroke: 'thick', type: 'arrow_circle' },
  { edgeStart: 'o-.', edgeEnd: '.-', stroke: 'dotted', type: 'arrow_circle' },
  { edgeStart: '<--', edgeEnd: '--', stroke: 'normal', type: 'arrow_point' },
  { edgeStart: '<==', edgeEnd: '==', stroke: 'thick', type: 'arrow_point' },
  { edgeStart: '<-.', edgeEnd: '.-', stroke: 'dotted', type: 'arrow_point' },

  { edgeStart: 'x--', edgeEnd: '----', stroke: 'normal', type: 'arrow_cross' },
  { edgeStart: 'x==', edgeEnd: '====', stroke: 'thick', type: 'arrow_cross' },
  { edgeStart: 'x-.', edgeEnd: '...-', stroke: 'dotted', type: 'arrow_cross' },
  { edgeStart: 'o--', edgeEnd: '----', stroke: 'normal', type: 'arrow_circle' },
  { edgeStart: 'o==', edgeEnd: '====', stroke: 'thick', type: 'arrow_circle' },
  { edgeStart: 'o-.', edgeEnd: '...-', stroke: 'dotted', type: 'arrow_circle' },
  { edgeStart: '<--', edgeEnd: '----', stroke: 'normal', type: 'arrow_point' },
  { edgeStart: '<==', edgeEnd: '====', stroke: 'thick', type: 'arrow_point' },
  { edgeStart: '<-.', edgeEnd: '...-', stroke: 'dotted', type: 'arrow_point' },
  // -----------------------------------------------------------------------------------------------------------------------

];