Add whitespace change detection utility and integrate into PatchTree. Enhanced PatchTree to count line changes specifically for Source properties, distinguishing between total and whitespace-only changes. Updated theme colors for visual representation of whitespace changes in the UI.

plugin/src/WhitespaceUtil.lua

@@ -0,0 +1,50 @@
+--[[
+	Utility for detecting whitespace-only changes in source code.
+]]
+
+local WhitespaceUtil = {}
+
+local function SplitLines(str: string): { string }
+	local lines = {}
+	for line in string.gmatch(str .. "\n", "([^\n]*)\n") do
+		table.insert(lines, line)
+	end
+	return lines
+end
+
+local function NormalizeLine(line: string): string
+	return string.gsub(string.gsub(line, "\r+$", ""), "[ \t]+$", "")
+end
+
+-- Counts lines that differ between two strings (capped at 100)
+-- Returns: totalDiff, whitespaceDiff (lines that only differ in whitespace)
+-- Returns 10000, 10000 if exceeds 100 (frontend displays as "100+")
+function WhitespaceUtil.CountLineDifferences(current: string, incoming: string): (number, number)
+	if type(current) ~= "string" or type(incoming) ~= "string" then
+		return 0, 0
+	end
+
+	local currentLines = SplitLines(current)
+	local incomingLines = SplitLines(incoming)
+	local maxLines = math.max(#currentLines, #incomingLines)
+
+	local totalDiff, whitespaceDiff = 0, 0
+	for i = 1, maxLines do
+		local currentLine = currentLines[i] or ""
+		local incomingLine = incomingLines[i] or ""
+
+		if currentLine ~= incomingLine then
+			totalDiff += 1
+			if NormalizeLine(currentLine) == NormalizeLine(incomingLine) then
+				whitespaceDiff += 1
+			end
+			if totalDiff > 100 then
+				return 10000, 10000
+			end
+		end
+	end
+
+	return totalDiff, whitespaceDiff
+end
+
+return WhitespaceUtil