LayoutTree: no hideCaret animation for 1st thought

[ethan-james]

Fixes #2708

Any hideCaret animation value will trigger the animation when it is first applied. If there's only one thought, use 'none' as the animation value, which will not play an animation. There will not be any indentation changes while only one thought exists, so there will be no need to hide the caret.

[trevinhofmann]

@ethan-james or @raineorshine -- Can you please clarify how to reproduce the original bug described in #2708? When testing main on Desktop (Chrome) and iOS (Safari), I am not seeing the carrot be hidden for 750ms when creating a new thought (or subthought). The caret seems to appear immediately/correctly for me.

[raineorshine]

When creating a new though in an empty thoughtspace on mobile Safari, the caret is initially hidden.

I can test this one, no problem. I can't think of what the difference might be!

trim.2928C247-C19E-4D6E-A7F0-D2F04CC0D6BA.MOV

[raineorshine]

Thanks! I confirm it works for the first thought.

It looks like there is a regression where the caret is now hidden when creating a sibling thought or subthought. I confirmed it does not occur in main. Could you like into this?

Steps to Reproduce

1. Create a new thought a.
2. Close the keyboard.
3. Activate New Thought or New Subthought.

Current Behavior

Caret is hidden.

Expected Behavior

Caret should not be hidden. Caret should only be hidden when animating indent.

[ethan-james]

I think I came up with a better CSS-based solution that doesn't rely on changing the animation name when new thoughts are added.

[raineorshine]

Interesting. Seems to work!

Thanks for the explanatory comment.