Tower 4 Merge Conflict Resolution: GUI vs CLI Decision Guide

Decision: Visual Merge Editor vs Manual CLI

When a merge produces conflicts, you must choose between Tower 4's built‑in 3‑way merge editor and resolving markers on the command line. The choice affects error risk, speed, and how much historical context you see.

Constraints

• Team uses Tower 4 (v4.x) on macOS and Windows.
• Repository contains multiple files with overlapping changes.
• Developers need to preserve logic, not just syntax.

Option Comparison

Factor	Tower 4 Visual Editor	Manual CLI (git merge)
Context	3‑way view: Base, Local, Remote	2‑way diff with conflict markers only
Error proneness	Low – button‑driven acceptance	High – manual marker removal
Bulk resolution speed	Fast – “Accept Mine/Theirs” per file or hunk	Fast for single file, slow for many
Staging	Automatic on resolve	Requires git add
Cross‑platform consistency	Minor UI differences, same merge logic	Identical behavior everywhere

Trade‑offs

The visual editor shines when you need the common ancestor (Base) to understand why both branches changed the same lines. It also prevents accidental deletion of conflict markers. The CLI is lighter for quick one‑off fixes and works in headless environments.

Concrete Implementation: Resolve a Conflict in Tower 4

1. Create the conflict: In a local repo, create branches feature-a and feature-b. Edit the same line in src/config.js on each branch and commit.
2. Start the merge: In Tower, checkout feature-a and choose Merge → feature-b into feature-a.
3. Open the 3‑way editor: Tower lists conflicted files. Double‑click src/config.js to open the merge view showing Base (left), Local (middle), Remote (right), and Result (bottom).
4. Resolve:
   • Inspect Base to see original code.
   • Click Accept Local to keep your change, or Accept Remote for the incoming change.
   • If a blend is needed, edit the Result pane directly.
5. Complete: Click Resolve. Tower stages the file automatically. Commit the merge from the commit panel.

Validation Step

After the merge, verify no conflict markers remain:

# Run from repository root
grep -r "<<<<<<" .

No output means all markers are cleared. Additionally, run your test suite to catch logic‑level regressions the visual editor cannot detect.

Limitations

• Logic dependencies: The editor resolves text conflicts only. Renaming a function in one branch while another calls the old name produces no marker but breaks the build.
• Line‑ending handling: Windows (CRLF) vs macOS (LF) can cause spurious conflicts; ensure core.autocrlf is configured consistently.
• OS UI differences: Minor shortcut variations exist between Windows and macOS builds of Tower 4.