Fix cancellation procedure.

src/bed/run.cc

@@ -168,10 +168,12 @@ void BEd::handle(std::string_view cmd, bool eof) {
       std::tie(vase, lang, state) = c.function->pre_text_mode(*this, address, c.argument);
     internal::ui::text_mode::TextMode tm(*this, vase, lang, state);
     auto [a, b] = tm.run();
-    if (!b)
+    if (!b) {
       text = a;
-    else
+    } else {
       internal::vase::Shard::release(a);
+      throw ed_error("Operation cancelled.");
+    }
   }
   if (c.function->handle)
     c.function->handle(*this, address, text, c.argument, nullptr);

src/internal/ui/text_mode/text_mode.cc

@@ -159,6 +159,7 @@ std::pair<vase::Shard *, bool> TextMode::run_terminal() {
   term_height = rows;
   redraw();
   bool running = true;
+  bool cancelled = false;
 
   while (running) {
     redraw();
@@ -176,8 +177,10 @@ std::pair<vase::Shard *, bool> TextMode::run_terminal() {
       case io::KeyEvent::Modifier::ALT:
       case io::KeyEvent::Modifier::CTRL_ALT:
       case io::KeyEvent::Modifier::CTRL:
-        if (res.text[0] == 'c')
+        if (res.text[0] == 'c') {
-          return {vase, true};
+          cancelled = true;
+          running = false;
+        }
         break;
       case io::KeyEvent::Modifier::NONE:
         if (res.text[0] == '\b' || res.text[0] == 0x7f) {
@@ -314,7 +317,7 @@ std::pair<vase::Shard *, bool> TextMode::run_terminal() {
   uint16_t last_row = start + required_height;
   bed.io.move_cursor(last_row, 1);
   bed.io.write("\n");
-  return {vase, false};
+  return {vase, cancelled};
 }
 
 void TextMode::grow() {