📂 Implement multiple terminal sessions/tabs

[kshivang]

Feature Description

Add support for multiple terminal sessions/tabs in a single window.

Current Status

❌ NOT IMPLEMENTED - Only single terminal instance supported

Legacy UI Capabilities

The legacy ui/ module has:

• TerminalSession - Session management
• TerminalWidget - Multiple terminal instances
• Tab support for multiple shells
• Session lifecycle management
• TerminalWidgetListener for session events

Proposed Implementation

1. Tab Bar UI

• Horizontal tab strip at top
• "+" button to create new tab
• "X" button on each tab to close
• Tab titles (shell name or custom title)
• Active tab highlighting

2. Session Management

data class TerminalTab(
    val id: String,
    val title: String,
    val terminal: JediTerminal,
    val ttyConnector: TtyConnector,
    val dataStream: BlockingTerminalDataStream
)

class SessionManager {
    val tabs: StateFlow<List<TerminalTab>>
    val activeTabId: StateFlow<String?>
    
    fun createNewTab(shell: String = "/bin/zsh")
    fun closeTab(id: String)
    fun switchToTab(id: String)
}

3. Keyboard Shortcuts

• Ctrl+T / Cmd+T - New tab
• Ctrl+W / Cmd+W - Close tab
• Ctrl+Tab - Next tab
• Ctrl+Shift+Tab - Previous tab
• Ctrl+1-9 / Cmd+1-9 - Jump to tab N

4. Tab Lifecycle

• Each tab has independent:
  • Terminal state
  • PTY connection
  • Scrollback buffer
  • Selection state

Priority

🟡 MEDIUM - Power users expect tabs, but can use OS terminal tabs as workaround

Files to Modify

• compose-ui/src/desktopMain/kotlin/org/jetbrains/jediterm/compose/demo/Main.kt
• Create new: compose-ui/src/desktopMain/kotlin/org/jetbrains/jediterm/compose/SessionManager.kt
• Create new: compose-ui/src/desktopMain/kotlin/org/jetbrains/jediterm/compose/TabBar.kt

References

• Legacy: ui/src/com/jediterm/terminal/ui/TerminalSession.java
• Legacy: ui/src/com/jediterm/terminal/ui/TerminalWidget.java