Abort a flickered-on window through the map read (wewx 83->3)

The stray 8-pixel window tiles left in m3_lcdc_win_en_change_multiple_wx
were the drop-side of the same LCDC-pulse phase the activation desync
handles: when the window turns on for a dot and straight back off, the
disabling write lands a couple of dots later on our fetcher timeline
than on hardware, so by the time we check, the fetch had already passed
GET_TILE_T2 and pushed a window tile. Extending the window-drop check
through GET_TILE_DATA_LOW_T2 (and restarting the fetch as background
from GET_TILE_T2 onward) aborts those fetches with no window pixels,
matching hardware. m3_lcdc_win_en_change_multiple stays pixel-perfect
and no other test moves; mealybug DMG total 537 -> 457.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01J1wLWscyUGS7CFwc3CjJR8

Author: trekawek

core/src/main/java/eu/rekawek/coffeegb/core/gpu/phase/PixelTransfer.java

@@ -298,12 +298,14 @@ public boolean tick() {
         if (window
                 && !lcdc.isWindowDisplay()
                 && objStep < 0
-                && fetcher.getState() <= Fetcher.GET_TILE_T2) {
-            // the write disabling the window can commit one dot after our fetch's T1
-            // and still catch the fetch on hardware (the map is only read later):
-            // dropping at T2 restarts the fetch so the map offset recomputes as
-            // background (m3_lcdc_win_en_change_multiple)
-            if (fetcher.getState() == Fetcher.GET_TILE_T2) {
+                && fetcher.getState() <= Fetcher.GET_TILE_DATA_LOW_T2) {
+            // the write disabling the window catches the fetch through GET_TILE_DATA_LOW_T2
+            // (the map read): our LCDC-pulse commit lands a couple of dots later on the
+            // fetcher timeline than hardware, so a window that flickers on and straight
+            // back off produces no window pixels only if we still abort the fetch here.
+            // Restarting from T2 onwards recomputes the map offset as background
+            // (m3_lcdc_win_en_change_multiple, and the stray 8-px window tiles in wewx).
+            if (fetcher.getState() >= Fetcher.GET_TILE_T2) {
                 fetcher.restartTile();
             }
             window = false;

core/src/test/java/eu/rekawek/coffeegb/core/integration/mealybug/MealybugRomTest.java

@@ -42,7 +42,7 @@ public class MealybugRomTest {
             Map.entry("m3_lcdc_tile_sel_change.gb", 0),
             Map.entry("m3_lcdc_tile_sel_win_change.gb", 192),
             Map.entry("m3_lcdc_win_en_change_multiple.gb", 0),
-            Map.entry("m3_lcdc_win_en_change_multiple_wx.gb", 83),
+            Map.entry("m3_lcdc_win_en_change_multiple_wx.gb", 3),
             Map.entry("m3_lcdc_win_map_change.gb", 92),
             Map.entry("m3_obp0_change.gb", 0),
             Map.entry("m3_scx_high_5_bits.gb", 0),