Install libqscintilla2-qt4-13-dbg by entering the following commands in the terminal:
sudo apt update sudo apt install libqscintilla2-qt4-13-dbg
Qt4 port of the Scintilla source code editing widget (debug)
QScintilla is a text editor for Qt4 with features especially useful when writing and debugging source code. These include support for syntax styling, error indicators, code completion, call tips and margins. . Styling choices are more open than with many editors, allowing the use of proportional fonts, bold and italics, multiple foreground and background colours and multiple fonts. . This package contains the debug extensions.