Aggressive refresh on resize of Tree widget

[Jacalz]

Checklist

• I have searched the issue tracker for open issues that relate to the same problem, before opening a new one.
• This issue only relates to a single bug. I will open new issues for any other problems.

Describe the bug

I noticed in some code refactoring that the Tree widget overrides the .Resize() methods using some internal parts of the base widget and manually does a refresh instead of repaint. This is technically wrong both from how widgets should be have and from a performance stand point.

fyne/widget/tree.go

Lines 239 to 248 in 4a875d9

	// Resize sets a new size for a widget.
	func (t *Tree) Resize(size fyne.Size) {
	if size == t.size.Load() {
	return
	}
	t.size.Store(size)
	t.Refresh() // trigger a redraw
	}

fyne/widget/tree.go

Lines 599 to 607 in 4a875d9

	func (c *treeContent) Resize(size fyne.Size) {
	if size == c.size.Load() {
	return
	}
	c.size.Store(size)
	c.Refresh() // trigger a redraw
	}

How to reproduce

1. Remove extended resize methods
2. Notice that the test fail

Screenshots

No response

Example code

See reproduction steps above. Easier to see in tests and than demo.

Fyne version

v2.5.3

Go compiler version

1.23.4

Operating system and version

Fedora Silverblue 41

Additional Information

No response