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vim-patch:8.2.1703: ":highlight clear" does not restore default link

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Problem:    ":highlight clear" does not restore default link.
Solution:   Remember the default link and restore it. (Antony Scriven,
            closes vim/vim#6970, closes vim/vim#4405)
213da551de
This commit is contained in:
Andy K. Massimino
2021-03-04 00:58:07 -05:00
parent 4e6b31d978
commit 8601e8b0d6
3 changed files with 64 additions and 19 deletions
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30
src/nvim/syntax.c
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@@ -59,6 +59,7 @@ struct hl_group {
bool sg_cleared; ///< "hi clear" was used
int sg_attr; ///< Screen attr @see ATTR_ENTRY
int sg_link; ///< link to this highlight group ID
int sg_deflink; ///< default link; restored in highlight_clear()
int sg_set; ///< combination of flags in \ref SG_SET
sctx_T sg_script_ctx; ///< script in which the group was last set
// for terminal UIs
@@ -6601,6 +6602,7 @@ void do_highlight(const char *line, const bool forceit, const bool init)
const char *to_end;
int from_id;
int to_id;
struct hl_group *hlgroup = NULL;
from_end = (const char *)skiptowhite((const char_u *)from_start);
to_start = (const char *)skipwhite((const char_u *)from_end);
@@ -6627,7 +6629,14 @@ void do_highlight(const char *line, const bool forceit, const bool init)
(int)(to_end - to_start));
}
if (from_id > 0 && (!init || HL_TABLE()[from_id - 1].sg_set == 0)) {
if (from_id > 0) {
hlgroup = &HL_TABLE()[from_id - 1];
if (dodefault && (forceit || hlgroup->sg_deflink == 0)) {
hlgroup->sg_deflink = to_id;
}
}
if (from_id > 0 && (!init || hlgroup->sg_set == 0)) {
// Don't allow a link when there already is some highlighting
// for the group, unless '!' is used
if (to_id > 0 && !forceit && !init
@@ -6635,17 +6644,16 @@ void do_highlight(const char *line, const bool forceit, const bool init)
if (sourcing_name == NULL && !dodefault) {
EMSG(_("E414: group has settings, highlight link ignored"));
}
} else if (HL_TABLE()[from_id - 1].sg_link != to_id
|| HL_TABLE()[from_id - 1].sg_script_ctx.sc_sid
!= current_sctx.sc_sid
|| HL_TABLE()[from_id - 1].sg_cleared) {
} else if (hlgroup->sg_link != to_id
|| hlgroup->sg_script_ctx.sc_sid != current_sctx.sc_sid
|| hlgroup->sg_cleared) {
if (!init) {
HL_TABLE()[from_id - 1].sg_set |= SG_LINK;
hlgroup->sg_set |= SG_LINK;
}
HL_TABLE()[from_id - 1].sg_link = to_id;
HL_TABLE()[from_id - 1].sg_script_ctx = current_sctx;
HL_TABLE()[from_id - 1].sg_script_ctx.sc_lnum += sourcing_lnum;
HL_TABLE()[from_id - 1].sg_cleared = false;
hlgroup->sg_link = to_id;
hlgroup->sg_script_ctx = current_sctx;
hlgroup->sg_script_ctx.sc_lnum += sourcing_lnum;
hlgroup->sg_cleared = false;
redraw_all_later(SOME_VALID);
// Only call highlight changed() once after multiple changes
@@ -7106,6 +7114,8 @@ static void highlight_clear(int idx)
XFREE_CLEAR(HL_TABLE()[idx].sg_rgb_bg_name);
XFREE_CLEAR(HL_TABLE()[idx].sg_rgb_sp_name);
HL_TABLE()[idx].sg_blend = -1;
// Restore any default link.
HL_TABLE()[idx].sg_link = HL_TABLE()[idx].sg_deflink;
// Clear the script ID only when there is no link, since that is not
// cleared.
if (HL_TABLE()[idx].sg_link == 0) {