Remove trimming from tracing

CHANGELOG.md

@@ -1,6 +1,7 @@
 # Roact Changelog
 
 ## Unreleased Changes
+* Remove trimming from tracing ([#387](https://github.com/Roblox/roact/pull/387))
 
 ## [1.4.4](https://github.com/Roblox/roact/releases/tag/v1.4.4) (June 13th, 2022)
 * Added Luau analysis to the repository ([#372](https://github.com/Roblox/roact/pull/372))

src/Logging.lua

@@ -129,8 +129,8 @@ function Logging.warn(messageTemplate, ...)
 		table.insert(collector.warnings, message)
 	end
 
-	-- debug.traceback inserts a leading newline, so we trim it here
-	local trace = debug.traceback("", 2):sub(2)
+	-- Set message to nil so a newline doesn't get added.
+	local trace = debug.traceback(nil, 2)
 	local fullMessage = ("%s\n%s"):format(message, indent(trace, 1))
 
 	if outputEnabled then

src/createElement.lua

@@ -63,9 +63,8 @@ local function createElement(component, props, children)
 	}
 
 	if config.elementTracing then
-		-- We trim out the leading newline since there's no way to specify the
-		-- trace level without also specifying a message.
-		element.source = debug.traceback("", 2):sub(2)
+		-- We set the message to nil to prevent the newline from appearing.
+		element.source = debug.traceback(nil, 2)
 	end
 
 	return element