Environment

• TeXstudio 4.2.0
• Qt Version 6.2.2 (also tested with the Qt Version 5.15.2)
• macOS Catalina 10.15.7
• TeX 3.14159265 (TeX Live 2020)

Issue

I recently updated from 3.1.2 to 4.2.0 and I think I'm encountering a small performance regression. When using autocompletion for environments, initially only the first occurrence of the environment name is selected, unless I pause my typing for over 1 second. Previous versions (3.1.2, 4.0.0, 4.1.0, and 4.1.2) do not exhibit the issue.

Example and additional details

I'd expect the input sequence \beg<ENTER>theorem (regardless of typing speed) to result in

\begin{theorem}
    content...
\end{theorem}

but when typed without interruption it results in

\begin{theorem}
    content...
\end{*environment-name*}

instead. Also, if I wait only a bit longer after <ENTER>, the second occurrence of *environment-name* becomes visually highlighted, but is still not selected properly and continuing to type only results in the first occurrence of *environment-name* being replaced.