Editing inside a vector #2926
Description
I recently noticed that it’s not actually possible to edit the content of a vector by clicking on its placeholder in \vec{#?}.
Even if you click directly on the placeholder, the caret never enters the area under the vector arrow.
I’m not entirely sure what causes this behavior, but the placeholder doesn’t seem to receive an atom ID or the ML__selected class, which likely explains why it’s not focusable.
This issue doesn’t occur with commands like \underrightarrow{#?}, or with most other constructs such as square roots, where the placeholder behaves as expected.
Additionally, when the vector is inserted by clicking the keyboard button, the placeholder itself doesn’t seem to appear at all, as if it were invisible.
