The window icon is not displayed when I open SciTE. Sometimes it will display later if I do something within SciTE which causes the window to repaint.
I am using SciTE v5.1.6 on GTK 3.24.30 on Arch Linux. I am using the Wayfire wayland compositor, so the header bar is created with client side decorations.
Attached is a patch which fixes the issue for me.
I don't know which icon you are referring to so can't reproduce the issue. SciTE always seems to have an alt-tab icon. On Ubuntu there is always a top bar icon.
Committed anyway as [d40598]. Credited to j-camp - please respond if you want a different name to appear in the credits.
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Commit: [d40598]