update forced in MSG_SELECT_CHAIN

[mercury233]

Problem:

In the Standby phase, Dark Contract with the Witch can select among 2 effects, ① is optional, ③ is forced.

But the client didn't know which is forced. If chkAutoChain is enabled, the first effect will be selected to activate.

Solution:

Update MSG_SELECT_CHAIN, set forced to each chain options.

require Fluorohydride/ygopro-core#753

[Copilot]

Pull Request Overview

This PR updates the handling of MSG_SELECT_CHAIN to include a per‐option “forced” flag and adjusts buffer offsets and client logic accordingly. Key changes include:

• Adjust buffer skip calculations in various Analyze methods to match the new message layout.
• Extend flag handling to treat EDESC_OPERATION and EDESC_RESET as bitmasks, and add a forced‐flag bit into the high byte.
• Update auto‐chain logic to detect and auto‐select the forced option.

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
gframe/tag_duel.cpp	Updated buffer skip for MSG_SELECT_CHAIN
gframe/single_mode.cpp	Mirrored buffer skip change in single‐player mode
gframe/single_duel.cpp	Mirrored buffer skip change in duel analysis
gframe/replay_mode.cpp	Mirrored buffer skip change in replay analysis
gframe/event_handler.cpp	Switched comparisons to bitmask checks for desc flags
gframe/duelclient.cpp	Refactored parsing to read per‐option forced flag, updated auto‐chain logic

Comments suppressed due to low confidence (1)

gframe/duelclient.cpp:1765

• Add a unit or integration test to verify that when a forced option is present, chkAutoChain correctly selects the forced index and ignores other settings.

if(mainGame->chkAutoChain->isChecked() && mainGame->dField.chain_forced && !(mainGame->always_chain || mainGame->chain_when_avail)) {

[Copilot]

[nitpick] It may help future readers to document that the high byte of flag now carries the forced‐option bit (e.g. define an EDESC_FORCED mask), rather than using a raw shift.

Suggested change

	flag |= forced << 8;
	flag |= (forced * EDESC_FORCED);