M CHANGES → CHANGES

@@ -12,6 +12,7 @@ - GBA BIOS: Fix multiboot entry point (fixes Magic Floor)
  - GB Video: Delay LYC STAT check (fixes mgba.io/i/1331)
  - GB Video: Fix window being enabled mid-scanline (fixes mgba.io/i/1328)
  - GB I/O: Filter IE top bits properly (fixes mgba.io/i/1329)
+ - GBA Video: Fix scanline cache with scale factor change edge cases
 Other fixes:
  - Qt: More app metadata fixes
  - Qt: Fix load recent from archive (fixes mgba.io/i/1325)

M src/gba/renderers/video-software.c → src/gba/renderers/video-software.c

@@ -539,6 +539,14 @@ memcpy(softwareRenderer->cache[y].io, softwareRenderer->nextIo, sizeof(softwareRenderer->nextIo));
 		dirty = true;
 	}
 
+	if (GBARegisterDISPCNTGetMode(softwareRenderer->dispcnt) != 0) {
+		if (softwareRenderer->cache[y].scale[0][0] != softwareRenderer->bg[2].sx ||
+		    softwareRenderer->cache[y].scale[0][1] != softwareRenderer->bg[2].sy ||
+		    softwareRenderer->cache[y].scale[1][0] != softwareRenderer->bg[3].sx ||
+		    softwareRenderer->cache[y].scale[1][1] != softwareRenderer->bg[3].sy) {
+			dirty = true;
+		}
+	}
 	softwareRenderer->cache[y].scale[0][0] = softwareRenderer->bg[2].sx;
 	softwareRenderer->cache[y].scale[0][1] = softwareRenderer->bg[2].sy;
 	softwareRenderer->cache[y].scale[1][0] = softwareRenderer->bg[3].sx;