Fix differences between selection with keys and with mouse

Fixes #89

cmd/micro/bindings.go

@@ -293,14 +293,20 @@ func DefaultBindings() map[string]string {
 
 // CursorUp moves the cursor up
 func (v *View) CursorUp() bool {
-	v.cursor.ResetSelection()
+	if v.cursor.HasSelection() {
+		v.cursor.SetLoc(v.cursor.curSelection[0])
+		v.cursor.ResetSelection()
+	}
 	v.cursor.Up()
 	return true
 }
 
 // CursorDown moves the cursor down
 func (v *View) CursorDown() bool {
-	v.cursor.ResetSelection()
+	if v.cursor.HasSelection() {
+		v.cursor.SetLoc(v.cursor.curSelection[1])
+		v.cursor.ResetSelection()
+	}
 	v.cursor.Down()
 	return true
 }

cmd/micro/cursor.go

@@ -170,6 +170,7 @@ func (c *Cursor) SelectWord() {
 
 	c.curSelection[1] = ToCharPos(forward, c.y, c.v.buf) + 1
 	c.origSelection[1] = c.curSelection[1]
+	c.SetLoc(c.curSelection[1])
 }
 
 // AddWordToSelection adds the word the cursor is currently on to the selection
@@ -202,6 +203,8 @@ func (c *Cursor) AddWordToSelection() {
 		c.curSelection[1] = ToCharPos(forward, c.y, c.v.buf) + 1
 		c.curSelection[0] = c.origSelection[0]
 	}
+
+	c.SetLoc(c.curSelection[1])
 }
 
 // SelectTo selects from the current cursor location to the given location

cmd/micro/view.go

@@ -307,6 +307,7 @@ func (v *View) HandleEvent(event tcell.Event) {
 					v.lastClickTime = time.Now()
 
 					loc := v.cursor.Loc()
+					v.cursor.origSelection[0] = loc
 					v.cursor.curSelection[0] = loc
 					v.cursor.curSelection[1] = loc
 				}