fix(clipboard): route terminal copy through main process for Wayland (#18)

navigator.clipboard.writeText is gated on focus/user-activation and
silently fails on Linux/Wayland (Ozone). Replace with a main-process
clipboard.writeText via a new clipboard-write-text IPC.

Also register an xterm OSC 52 handler so programs inside the terminal
(notably Claude Code's copy-to-clipboard) can set the system clipboard;
xterm doesn't wire OSC 52 itself.

Port of upstream PR doctly#55 (ymajoros). Closes upstream
issue #54 from our fork's perspective; the upstream PR will close it
fully when merged.

Author: JeanBaptisteRenard

main.js

@@ -1,4 +1,4 @@
-const { app, BrowserWindow, dialog, ipcMain, Menu, screen, shell } = require('electron');
+const { app, BrowserWindow, clipboard, dialog, ipcMain, Menu, screen, shell } = require('electron');
 const { Worker } = require('worker_threads');
 const { execFile } = require('child_process');
 const path = require('path');
@@ -471,6 +471,14 @@ ipcMain.handle('open-external', (_event, url) => {
   if (/^https?:\/\//i.test(url)) return shell.openExternal(url);
 });
 
+// --- IPC: clipboard write ---
+// The renderer's navigator.clipboard.writeText is gated on focus/user-activation and
+// is flaky-to-dead on Linux/Wayland (Ozone). The main-process clipboard has no such
+// strings attached, so all terminal copies go through here.
+ipcMain.handle('clipboard-write-text', (_event, text) => {
+  if (typeof text === 'string') clipboard.writeText(text);
+});
+
 // --- IPC: MCP bridge ---
 ipcMain.on('mcp-diff-response', (_event, sessionId, diffId, action, editedContent) => {
   resolvePendingDiff(sessionId, diffId, action, editedContent);

preload.js

@@ -47,6 +47,7 @@ contextBridge.exposeInMainWorld('api', {
   deleteWorktree: (worktreePath) => ipcRenderer.invoke('delete-worktree', worktreePath),
   worktreeStatus: (worktreePath) => ipcRenderer.invoke('worktree-status', worktreePath),
   openExternal: (url) => ipcRenderer.invoke('open-external', url),
+  writeClipboard: (text) => ipcRenderer.invoke('clipboard-write-text', text),
 
   // Send (fire-and-forget)
   sendInput: (id, data) => ipcRenderer.send('terminal-input', id, data),

public/terminal-manager.js

@@ -63,7 +63,7 @@ function setupTerminalKeyBindings(terminal, container, getSessionId, { onFind }
     if (!isMac && e.key === 'c' && e.ctrlKey && !e.shiftKey && !e.altKey && !e.metaKey) {
       if (terminal.hasSelection()) {
         if (e.type === 'keydown') {
-          navigator.clipboard.writeText(terminal.getSelection()).catch(() => {});
+          window.api.writeClipboard(terminal.getSelection());
         }
         return false;
       }
@@ -191,6 +191,24 @@ function createTerminalEntry(session) {
     },
   });
 
+  // OSC 52 — let the program inside the terminal set the system clipboard (this is how
+  // Claude Code copies). xterm doesn't wire this up itself, so we do. Payload is
+  // "<selection>;<base64>" (or "<selection>;?" for a read-back query, which we ignore).
+  // Route through the main process — see writeClipboard — because the renderer clipboard
+  // is unreliable on Wayland.
+  terminal.parser.registerOscHandler(52, (payload) => {
+    const sep = payload.indexOf(';');
+    const b64 = sep === -1 ? payload : payload.slice(sep + 1);
+    if (!b64 || b64 === '?') return true;
+    try {
+      const bytes = Uint8Array.from(atob(b64), (ch) => ch.charCodeAt(0));
+      window.api.writeClipboard(new TextDecoder().decode(bytes));
+    } catch {
+      return false;
+    }
+    return true;
+  });
+
   const fitAddon = new FitAddon.FitAddon();
   terminal.loadAddon(fitAddon);
   terminal.loadAddon(new WebLinksAddon.WebLinksAddon((_event, url) => {