Fix initial panels being created too large

[Henri-J-Norden]

Issue: Panel.m_minSize is initialized to (200, 200), but when an initial panel with smaller tabContent is added, the panel is created larger than the tabContent, because in PanelUtils.CreatePanel:

• the call to result.AddTab calls Internal.RecalculateMinSize, which updates m_minSize to the correct value
• but this ^ is done after setting result.FloatingSize = contentRect.size;, which already clamped the panel size to the initial (200, 200) value

Fix: avoid initializing Panel.m_minSize to a value > 0 to support creating panels smaller than (200, 200)

[yasirkula]

On a project that I'm working on, I've encountered an issue where initial sizes of anchored panels wouldn't be respected in some cases. I've resolved it by changing the following lines:

UnityDynamicPanels/Plugins/DynamicPanels/Scripts/DynamicPanelsCanvas.cs

Lines 453 to 454 in 0d0a19d

	if( initialSizes.TryGetValue( panel, out initialSize ) )
	panel.ResizeTo( initialSize, Direction.Right, Direction.Top );

As follows:

if( initialSizes.TryGetValue( panel, out initialSize ) )
{
	if( initialSize.x <= Mathf.Epsilon )
		initialSize.x = panel.Size.x;
	if( initialSize.y <= Mathf.Epsilon )
		initialSize.y = panel.Size.y;

	panel.ResizeTo( initialSize, Direction.Right, Direction.Top );
}

I'm wondering if this fix applies to your scenario, as well. Did you encounter this issue on free panels? If not, could you provide simple repro steps for me to follow?

[Henri-J-Norden]

Yes, I had the issue with free panels. But I also encountered a related problem when using PanelUtils.CreatePanelFor, because the tab MinSize is set after changing the content rectTransform anchors and parent (so the content size is already changed from the initial when MinSize is recorded). My latest commit should fix both issues now.