fix(api): return both link and attributes with nvim_get_hl (#22824)

Problem: No way to get the actual highlight attributes for a linked
group through |nvim_get_hl()| (not the attributes from the link target).
Solution: Return the actual attributes as well as the link target name.

1 files changed, 14 insertions, 0 deletions

diff --git a/test/functional/api/highlight_spec.lua b/test/functional/api/highlight_spec.lua
index 65b13bebf7..a4bd574a56 100644
--- a/test/functional/api/highlight_spec.lua
+++ b/test/functional/api/highlight_spec.lua
@@ -561,4 +561,18 @@ describe('API: get highlight', function()
     eq({ link = 'String' }, meths.get_hl(0, { name = '@string' }))
     eq({ fg = 10937249 }, meths.get_hl(0, { name = '@string.cpp', link = false }))
   end)
+
+  it('can get all attributes for a linked group', function()
+    command('hi Bar guifg=red')
+    command('hi Foo guifg=#00ff00 gui=bold,underline')
+    command('hi! link Foo Bar')
+    eq({ link = 'Bar', fg = tonumber('00ff00', 16), bold = true, underline = true }, meths.get_hl(0, { name = 'Foo', link = true }))
+  end)
+
+  it('can set link as well as other attributes', function()
+    command('hi Bar guifg=red')
+    local hl = { link = 'Bar', fg = tonumber('00ff00', 16), bold = true, cterm = { bold = true } }
+    meths.set_hl(0, 'Foo', hl)
+    eq(hl, meths.get_hl(0, { name = 'Foo', link = true }))
+  end)
 end)