Update upscale.bat

assets/upscale.bat

@@ -1 +1,18 @@
-for /F %%x in ('dir /B/D 1x') do magick 1x\%%x -scale 200%% 2x\%%x
+@echo off
+for /F %%x in ('dir /B/D 2x') do (
+    if %%~xx == .png (
+        if not exist 1x\%%x (
+            echo Removing deleted file 1x\%%x from 2x\
+            del 2x\%%x
+        )
+    )
+)
+for /F %%x in ('dir /B/D 1x') do (
+    if %%~xx == .png (
+        REM https://stackoverflow.com/questions/1687014/how-do-i-compare-timestamps-of-files-in-a-batch-script/58323817#58323817
+        xcopy /LDY /-I 1x\%%x 2x\%%x | findstr /B /C:"1 " > nul 2>&1 && (
+            echo Updating changed file 1x\%%x in 2x\
+            magick 1x\%%x -filter point -resize 200%% 2x\%%x
+        )
+    )
+)