running gvim application window not visible

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Debian 10, KDE Plasma, Wayland.

PcManFM, right click on text file, open with GVIM. GVIM application window is not visible, is not on taskbar. It's visible in the application list after pressing Alt-Tab keys. GVIM temporary .swp file is present.

Same file can be correctly opened by another text editor.

Other files can be correctly opened by GVIM.

Anyone know please where is the problem ?