patch 8.2.4798: t_8u option was reset even when set by the user
Problem: t_8u option was reset even when set by the user.
Solution: Only reset t_8u when using the default value. (closes #10239)
diff --git a/src/term.c b/src/term.c
index abc8a38..0f80e9c 100644
--- a/src/term.c
+++ b/src/term.c
@@ -4826,7 +4826,9 @@
// This may cause some flicker. Alternative would be to set "t_8u"
// here if the terminal is expected to support it, but that might
// conflict with what was set in the .vimrc.
- if (term_props[TPR_UNDERLINE_RGB].tpr_status != TPR_YES && *T_8U != NUL)
+ if (term_props[TPR_UNDERLINE_RGB].tpr_status != TPR_YES
+ && *T_8U != NUL
+ && !option_was_set((char_u *)"t_8u"))
{
set_string_option_direct((char_u *)"t_8u", -1, (char_u *)"",
OPT_FREE, 0);