Search menu (F3) displays character which was pressed to open a context
specific search. This also breaks the old behavior of showing last searched
operator in text field, instead shows the pressed character.
To fix this, first store the `g_search_text/but->poin` string in
temp_buffer (before pressed key char is copied to `g_search_text`).
Later, restore the g_search_text after invoking the search menu.
Pull Request: https://projects.blender.org/blender/blender/pulls/112938
cea02c15f8