each time I open a visualGDB(5.4 r8) embedded project in visual studio 2019, the text color changes like the image below.
any suggestions to how to solve this problem ?
This is actually a known issue caused by a recent change in the internal color encoding of Visual Studio 2019.
We have already fixed it in the VisualGDB 5.4 branch (simply re-downloading the installer from http://visualgdb.com/download/ should resolve the problem) and will include the fix in VisualGDB 5.5 Preview 1 that will be released next week.
In case the incorrect settings get cached somewhere, please use Tools->Options->Environment->Fonts and Colors->Text Editor->C/C++ <...> to reset the background color of the affected items to the default value.