Kernel: TTY buffer is resized on font size change

Shell also has better line wrapping. You still can't visually go
back to previous line, but atleas we now write from the beginning
of the line

kernel/kernel/Shell.cpp

@@ -606,7 +606,7 @@ argument_done:
 			}
 		}
 
-		TTY_PRINT("\e[{}G", m_prompt_length + m_cursor_pos.col + 1);
+		TTY_PRINT("\e[{}G", (m_prompt_length + m_cursor_pos.col) % m_tty->width() + 1);
 	}
 
 }

kernel/kernel/TTY.cpp

@@ -55,6 +55,28 @@ void TTY::set_cursor_position(uint32_t x, uint32_t y)
 void TTY::set_font(const Kernel::Font& font)
 {
 	m_terminal_driver->set_font(font);
+
+	uint32_t new_width = m_terminal_driver->width();
+	uint32_t new_height = m_terminal_driver->height();
+
+	if (m_width != new_width || m_height != new_height)
+	{
+		Cell* new_buffer = new Cell[new_width * new_height];
+		ASSERT(new_buffer);
+
+		for (uint32_t i = 0; i < new_width * m_height; i++)
+			new_buffer[i] = { .foreground = m_foreground, .background = m_background, .character = ' ' };
+
+		for (uint32_t y = 0; y < BAN::Math::min<uint32_t>(m_height, new_height); y++)
+			for (uint32_t x = 0; x < BAN::Math::min<uint32_t>(m_width, new_width); x++)
+				new_buffer[y * new_width + x] = m_buffer[y * m_width + x];
+
+		delete[] m_buffer;
+		m_buffer = new_buffer;
+		m_width = new_width;
+		m_height = new_height;
+	}
+	
 	for (uint32_t y = 0; y < m_height; y++)
 		for (uint32_t x = 0; x < m_width; x++)
 			render_from_buffer(x, y);