Now moves cursor vertically for sixel newlines even if there is no si…

…xel data

metainfo.xml

@@ -103,6 +103,7 @@
       <description>
         <ul>
           <li>Fixes a problem with oversized glyphs being wrongly cut off (#821).</li>
+          <li>Fixes vertical cursor movement for sixel graphics with only newlines (#822)</li>
         </ul>
       </description>
     </release>

src/terminal/Screen.cpp

@@ -1643,7 +1643,7 @@ void Screen<Cell>::renderImage(shared_ptr<Image const> _image,
             cell.setImageFragment(rasterizedImage, CellLocation { offset.line, offset.column });
             cell.setHyperlink(_state.cursor.hyperlink);
         };
-        moveCursorTo(_topLeft.line + unbox<int>(linesToBeRendered) - 1, _topLeft.column);
+        moveCursorTo(_topLeft.line + unbox<int>(linesToBeRendered), _topLeft.column);
     }
 
     // If there're lines to be rendered missing (because it didn't fit onto the screen just yet)
@@ -1667,7 +1667,7 @@ void Screen<Cell>::renderImage(shared_ptr<Image const> _image,
         }
     }
     // move ansi text cursor to position of the sixel cursor
-    moveCursorToColumn(_topLeft.column + _gridSize.columns.as<ColumnOffset>());
+    moveCursorToColumn(_topLeft.column);
 }
 
 template <typename Cell>

src/terminal/Screen_test.cpp

@@ -3372,8 +3372,8 @@ TEST_CASE("Sixel.simple", "[screen]")
 
     mock.writeToScreen(sixelData);
 
-    CHECK(mock.terminal.primaryScreen().cursor().position.column == ColumnOffset(8));
-    CHECK(mock.terminal.primaryScreen().cursor().position.line == LineOffset(4));
+    CHECK(mock.terminal.primaryScreen().cursor().position.column == ColumnOffset(0));
+    CHECK(mock.terminal.primaryScreen().cursor().position.line == LineOffset(5));
 
     for (auto line = LineOffset(0); line < boxed_cast<LineOffset>(pageSize.lines); ++line)
     {
@@ -3410,7 +3410,7 @@ TEST_CASE("Sixel.AutoScroll-1", "[screen]")
 
     mock.writeToScreen(sixelData);
 
-    CHECK(mock.terminal.primaryScreen().cursor().position.column == ColumnOffset(8));
+    CHECK(mock.terminal.primaryScreen().cursor().position.column == ColumnOffset(0));
     CHECK(mock.terminal.primaryScreen().cursor().position.line == LineOffset(3));
 
     for (auto line = LineOffset(-1); line < boxed_cast<LineOffset>(pageSize.lines); ++line)

src/terminal/SixelParser.cpp

@@ -440,8 +440,7 @@ void SixelImageBuilder::rewind()
 void SixelImageBuilder::newline()
 {
     sixelCursor_.column = {};
-
-    if (unbox<int>(sixelCursor_.line) + 6 < unbox<int>(maxSize_.height))
+    if (unbox<int>(sixelCursor_.line) + 6 < unbox<int>(explicitSize_ ? size_.height : maxSize_.height))
         sixelCursor_.line.value += 6;
 }
 
@@ -477,6 +476,12 @@ void SixelImageBuilder::render(int8_t _sixel)
 
 void SixelImageBuilder::finalize()
 {
+    if (unbox<int>(size_.height) == 1)
+    {
+        size_.height = Height::cast_from(sixelCursor_.line.value);
+        buffer_.resize(size_.area() * 4);
+        return;
+    }
     if (!explicitSize_)
     {
         Buffer tempBuffer(static_cast<size_t>(size_.height.value * size_.width.value) * 4);

src/terminal/SixelParser_test.cpp

@@ -338,3 +338,17 @@ TEST_CASE("SixelParser.newline", "[sixel]")
         }
     }
 }
+
+TEST_CASE("SixelParser.vertical_cursor_advance", "[sixel]")
+{
+    auto constexpr defaultColor = RGBAColor { 0, 0, 0, 255 };
+    SixelImageBuilder ib(
+        { Width(5), Height { 30 } }, 1, 1, defaultColor, std::make_shared<SixelColorPalette>(16, 256));
+    auto sp = SixelParser { ib };
+
+    sp.parseFragment("$-$-$-$-");
+    sp.done();
+
+    REQUIRE(ib.size() == terminal::ImageSize { Width(1), Height(24) });
+    REQUIRE(ib.sixelCursor() == CellLocation { LineOffset(24), ColumnOffset { 0 } });
+}