feat(git): highlight only fatal/error lines in failure dump

test/git/cmd_test.lua

@@ -550,7 +550,7 @@ t.test(
 )
 
 t.test(
-    "streaming :G fetch (no bang) on failure dumps output to :messages with ErrorMsg",
+    "streaming :G fetch (no bang) on failure highlights only fatal/error lines",
     function()
         make_repo({ a = "x" })
         with_echo_stub(function(calls)
@@ -558,24 +558,33 @@ t.test(
             t.wait_for(function()
                 return has_status(calls, "failed")
             end, "failed progress notification", 5000)
-            local body = ""
+            ---@type table?
+            local dump
             for _, c in ipairs(calls) do
-                if
-                    c.history == true
-                    and c.chunks[1]
-                    and c.chunks[1][2] == "ErrorMsg"
-                then
-                    body = c.chunks[1][1]
+                if c.history == true then
+                    dump = c.chunks
                     break
                 end
             end
-            t.truthy(body ~= "", "expected ErrorMsg history dump")
-            local lower = string.lower(body)
+            t.truthy(dump, "expected history dump")
+            ---@cast dump -nil
+            local fatal_chunks_red, plain_continuation = 0, false
+            for _, chunk in ipairs(dump) do
+                local text, hl = chunk[1], chunk[2]
+                if text:match("^fatal:") and hl == "ErrorMsg" then
+                    fatal_chunks_red = fatal_chunks_red + 1
+                end
+                if text:match("Please make sure") and hl ~= "ErrorMsg" then
+                    plain_continuation = true
+                end
+            end
             t.truthy(
-                lower:match("repository")
-                    or lower:match("remote")
-                    or lower:match("fatal"),
-                "expected error mention in dump, got: " .. body
+                fatal_chunks_red >= 1,
+                "expected at least one fatal: line highlighted as ErrorMsg"
+            )
+            t.truthy(
+                plain_continuation,
+                "expected continuation line to be plain"
             )
         end)
     end