Close #204. Add Trello dependency to /vendor

vendor/github.com/rivo/tview/flex.go

@@ -28,7 +28,7 @@ type Flex struct {
 	*Box
 
 	// The items to be positioned.
-	items []flexItem
+	items []*flexItem
 
 	// FlexRow or FlexColumn.
 	direction int
@@ -86,7 +86,7 @@ func (f *Flex) SetFullScreen(fullScreen bool) *Flex {
 // You can provide a nil value for the primitive. This will still consume screen
 // space but nothing will be drawn.
 func (f *Flex) AddItem(item Primitive, fixedSize, proportion int, focus bool) *Flex {
-	f.items = append(f.items, flexItem{Item: item, FixedSize: fixedSize, Proportion: proportion, Focus: focus})
+	f.items = append(f.items, &flexItem{Item: item, FixedSize: fixedSize, Proportion: proportion, Focus: focus})
 	return f
 }
 
@@ -101,6 +101,19 @@ func (f *Flex) RemoveItem(p Primitive) *Flex {
 	return f
 }
 
+// ResizeItem sets a new size for the item(s) with the given primitive. If there
+// are multiple Flex items with the same primitive, they will all receive the
+// same size. For details regarding the size parameters, see AddItem().
+func (f *Flex) ResizeItem(p Primitive, fixedSize, proportion int) *Flex {
+	for _, item := range f.items {
+		if item.Item == p {
+			item.FixedSize = fixedSize
+			item.Proportion = proportion
+		}
+	}
+	return f
+}
+
 // Draw draws this primitive onto the screen.
 func (f *Flex) Draw(screen tcell.Screen) {
 	f.Box.Draw(screen)