Fix fish prompt OSC highlighting (#998)

src/ui/lib/terminal-syntax-highlighter.test.ts

@@ -76,6 +76,16 @@ describe("highlightTerminalOutput", () => {
     expect(highlightTerminalOutput(chunk)).toBe(chunk);
   });
 
+  it("skips OSC current-directory sequences used by fish prompts", () => {
+    const chunk = `${ESC}]7;file://server/home/user/docker/sonarr\x07user@server ~/docker/sonarr> `;
+    expect(highlightTerminalOutput(chunk)).toBe(chunk);
+  });
+
+  it("skips OSC title sequences", () => {
+    const chunk = `${ESC}]0;user@server:/var/log\x07ERROR after title`;
+    expect(highlightTerminalOutput(chunk)).toBe(chunk);
+  });
+
   it("highlights text that already has ANSI codes", () => {
     let heavy = "";
     for (let i = 0; i < 12; i++) heavy += `${ESC}[32mgreen${ESC}[0m `;

src/ui/lib/terminal-syntax-highlighter.ts

@@ -62,6 +62,7 @@ const MAX_LINE_LENGTH = 2000;
 // extra SGR bytes into a full-screen redraw and corrupt xterm's cursor state.
 const TUI_SEQUENCE = /\x1b\[(?:[\d;]*[ABCDEFGHJKST]|\?[\d;]*[hl])/;
 const TUI_FRAME_SEQUENCE = /[\u2500-\u257f]|\x1b[()][0B]|\x1b\[[0-9;]*[~`]/;
+const CONTROL_STRING_SEQUENCE = /\x1b[\]P^_]/;
 
 // A bare \r (not immediately followed by \n) means the terminal is overwriting
 // the current line (shell prompts, progress bars). Highlighting mid-rewrite
@@ -400,6 +401,7 @@ export function highlightTerminalOutput(
 
   if (TUI_SEQUENCE.test(text)) return text;
   if (TUI_FRAME_SEQUENCE.test(text)) return text;
+  if (CONTROL_STRING_SEQUENCE.test(text)) return text;
   if (MID_LINE_CR.test(text)) return text;
 
   const activePatterns = buildActivePatterns(options);