First, open a terminal and type: echo $GTK_IM_MODULECan you give me a somewhat simpler help?
If I do that here, there is no output i.e. GTK_IM_MODULE seems not to be set. What do you find?
Then set it in that terminal:
export GTK_IM_MODULE=gtk-im-context-simple
and run CodeLite from that terminal by typing:
/usr/bin/codelite
Do you have the backspace problem in that CodeLite instance?
If that fixes the problem, then you know how to proceed. If not, try running the wxWidgets 'text' sample. Unfortunately the samples don't seem to be supplied by fedora, so I've attached the 'text' sample, slightly fixed.
First install the fedora wxGTK3 and wxGTK3-devel packages:
#> dnf install wxGTK3 wxGTK3-devel
Then create an empty dir somewhere, download the attached textsample.tar.gz there and extract it.
Then open a terminal in that dir and run:
g++ text.cpp $(wx-config --cxxflags --libs) -o text
That should have built the sample. Run it by doing: ./text
Try typing some text in it and seeing if backspace freezes there.
That's enough for now. If you report back that the problem continues and the sample freezes, I'll explain the next steps.