Trim whitespace on terminal copy by default, keep raw copy on Ctrl+Shift+Alt+C and right-click menu

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/src/components/terminal/trimSelection.test.ts

@@ -0,0 +1,65 @@
+import { describe, it, expect } from "vitest";
+import { trimSelection } from "./trimSelection";
+
+describe("trimSelection", () => {
+  it("returns empty string unchanged", () => {
+    expect(trimSelection("")).toBe("");
+  });
+
+  it("trims leading and trailing whitespace on a single line", () => {
+    expect(trimSelection("    hello    ")).toBe("hello");
+  });
+
+  it("dedents common leading whitespace while preserving inner indent", () => {
+    const input = "    def foo():\n        return 1\n";
+    expect(trimSelection(input)).toBe("def foo():\n    return 1");
+  });
+
+  it("strips leading and trailing blank lines", () => {
+    const input = "\n\n  hello\n\n";
+    expect(trimSelection(input)).toBe("hello");
+  });
+
+  it("preserves interior blank lines", () => {
+    const input = "  line1\n\n  line2";
+    expect(trimSelection(input)).toBe("line1\n\nline2");
+  });
+
+  it("is idempotent on already-clean text", () => {
+    const clean = "def foo():\n    return 1";
+    expect(trimSelection(clean)).toBe(clean);
+    expect(trimSelection(trimSelection(clean))).toBe(clean);
+  });
+
+  it("ignores blank lines when computing the common indent", () => {
+    // The blank line has 0 leading whitespace but shouldn't force minIndent to 0.
+    const input = "    a\n\n    b";
+    expect(trimSelection(input)).toBe("a\n\nb");
+  });
+
+  it("strips trailing whitespace per line", () => {
+    const input = "alpha   \nbeta\t\t\ngamma";
+    expect(trimSelection(input)).toBe("alpha\nbeta\ngamma");
+  });
+
+  it("handles mixed-width padding (pads to min)", () => {
+    const input = "    one\n  two\n      three";
+    // minIndent = 2
+    expect(trimSelection(input)).toBe("  one\ntwo\n    three");
+  });
+
+  it("handles tabs as leading whitespace", () => {
+    const input = "\tfoo\n\t\tbar";
+    // minIndent = 1 tab
+    expect(trimSelection(input)).toBe("foo\n\tbar");
+  });
+
+  it("returns empty when input is only whitespace", () => {
+    expect(trimSelection("   \n  \n")).toBe("");
+  });
+
+  it("leaves a zero-indent line alone (no false dedent)", () => {
+    const input = "no-indent\n  indented";
+    expect(trimSelection(input)).toBe("no-indent\n  indented");
+  });
+});