fix: show updated field value after editing in horizontal blocks

[asdsteven]

Problem:
In horizontal blocks, let's say you created a control_repeat block, if you edit the number of iteration from 4 to 5, after pressing Enter, the number is still shown as 4.

Cause:
field.js setText function would call forceRerender. Currently, forceRerender would set this.size_.width to 0 to force a render_() call later. However, this would work only if this.getSize() is indeed called later to trigger this.render_(), which is the case for vertical blocks, but not for horizontal blocks, causing the updated value not being shown.

Fix:
Setting this.size_.width to 0 was a silly trick. Since our purpose is to force render_() anyway, we could have simply called render_() directly. One may argue that, render_() should not be called immediately; some setup from sourceBlock_.render() needs to be done before this.render_() maybe called. Well, this is not true. this.render_() does not depend on sourceBlock_, or anything. We can just call it immediately.

[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[asdsteven]

I have read the CLA Document and I hereby sign the CLA