home toggles between start of line and start of text

by default home sends the cursor to the beginning of the line.
if the cursor is at the beginning of the line already though, home
will send the cursor to the first non-whitespace rune. tapping home
will toggle between these two line starts.

cmd/micro/actions.go

@@ -435,7 +435,11 @@ func (v *View) StartOfLine(usePlugin bool) bool {
 
 	v.deselect(0)
 
-	v.Cursor.Start()
+	if v.Cursor.X != 0 {
+		v.Cursor.Start()
+	} else {
+		v.Cursor.StartOfText()
+	}
 
 	if usePlugin {
 		return PostActionCall("StartOfLine", v)

cmd/micro/cursor.go

@@ -333,6 +333,18 @@ func (c *Cursor) Start() {
 	c.LastVisualX = c.GetVisualX()
 }
 
+// StartOfText moves the cursor to the first non-whitespace rune of 
+// the line it is on
+func (c *Cursor) StartOfText() {
+	c.Start()
+	for IsWhitespace(c.RuneUnder(c.X)) {
+		if c.X == Count(c.buf.Line(c.Y)) {
+			break
+		}
+		c.Right()
+	}
+}
+
 // GetCharPosInLine gets the char position of a visual x y
 // coordinate (this is necessary because tabs are 1 char but
 // 4 visual spaces)