[Exmeaning]

Fixes #4

Root Causes (MuMu 12 v5.x / v6.x, e.g. 6.4.6.0 on 127.0.0.1:16416)

1. Multi-display virtual screen (app_keptlive / game tab mode)

   • When MuMu 12's background keep-alive or multi-tab mode is enabled, games launch on a secondary Android virtual display (e.g. displayId=2, portrait 761x1376) while displayId=0 remains on app.lawnchair/.LawnchairLauncher with mCurrentFocus=null.
   • scrcpy, adb input, screencap, rotation resolution, and wm size previously targeted only primary displayId=0, showing the empty launcher instead of the active game.

2. MuMu instance & window discovery (-v <index>, elevated MuMuVMMSVC, relocated VMs, helper windows)

   • MuMuNxDevice.exe passes numeric -v 1 / --vmindex 1 on its command line, while MuMuVMMHeadless.exe runs under the SYSTEM service MuMuVMMSVC (unreadable CLI from an un-elevated process).
   • Previously DetectMuMu fell back to FirstMuMuVm(install, 0), returning null whenever instance 0 had been deleted or was not the running instance (leaving the emulator / window binding list empty).

Changes (modeled on MaaFramework / MAA)

• Active Display & Foreground App Resolution (DisplayFocusParser, MuMuExternalRenderer)
  • Parse dumpsys window starting at WINDOW MANAGER DISPLAY CONTENTS (ignoring stale LAST ANR blocks) to resolve per-display mCurrentFocus, mFocusedApp, resolution, DPI, and mTopFocusedDisplayId, prioritizing non-launcher foreground apps over launcher/system windows.
  • Optional dynamic bridge to MuMu's official external_renderer_ipc.dll (nx_device/{15.0,12.0}/shell/sdk/external_renderer_ipc.dll) via nemu_connect / nemu_get_display_id / nemu_capture_display for multi-tab tie-breaking and secondary-display capture fallback.
• Live Display Switching & Multi-Display Input (ScrcpySession, AdbInputInjector, AdbService, DeviceHub)
  • Pass display_id=<id> to scrcpy-server 4.1 and add in-place ScrcpySession.SwitchDisplay(int) with automatic fallback to displayId=0 when a game tab closes.
  • Route adb input (tap, swipe, motionevent, keyevent, text) with -d <displayId> on Android 10+ (SDK >= 29), resolve per-display rotation, validate screencap -d <id> PNG headers, and monitor active display/foreground app in DeviceHub.
• MuMu 5.x/6.x Detection & Window Binding (EmulatorCatalog, EmulatorConfigParsers, EmulatorDetector, WindowEnumerator, BindWindowDialog)
  • Support -v <N> / --vmindex <N> / --index <N>, MAA's full port/index formulas (16384 + (i % 32) * 32 + (i / 32) * 4 and inverse MuMuPortToIndex), MuMuManager.exe info/adb --vmindex all fallback (with main_wnd HWND matching), auxiliary Qt popup filtering (HintWnd, MessageWnd, *ToolSaveBits), and enriched window-binding / device / mirror / MCP (get_foreground_app) diagnostics.