Fix a deadlock during cooked reads (#19994)

Closes #19922

## Validation Steps Performed
* The repro now works as expected ✅
  (`CreatePseudoConsole({1,20})` + `WriteFile("キ")`)

src/host/readDataCooked.cpp

@@ -1313,6 +1313,15 @@ COOKED_READ_DATA::LayoutResult COOKED_READ_DATA::_layoutLine(std::wstring& outpu
             til::CoordType cols = 0;
             const auto len = textBuffer.FitTextIntoColumns(text, columnLimit - column, cols);
 
+            // GH#19922: We need to account for terminals that are just 1 column wide, as we may deadlock otherwise.
+            // `columnLimit - column == 1` will then prevent `FitTextIntoColumns` from fitting any wide glyphs.
+            // We can detect this by checking for `len == 0`, skip the offending glyph and break out of the deadlock.
+            if (len == 0) [[unlikely]]
+            {
+                it += textBuffer.GraphemeNext(text, 0);
+                break;
+            }
+
             output.append(text, 0, len);
             column += cols;
             it += len;