Hi, I have the google pinyin keyboard installed, it is working fine everywhere else apparently (i.e. browser, vscode, libreoffice etc), for example 如此. However I simply could not get the input method to change in Text Editor and Notepad Next. Is there any reason/resolution on this?
In which package format are the editors installed? You could try another package format to see if it works then, e.g. the AppImage of Notepad Next (you can download it from github).
Do you refer to the preinstalled gnome text editor?
I'm not sure if it may help to reboot or to switch to Xorg for testing if you are on Wayland. At loginscreen click on your profile then a cog wheal appears at the bottom right corner where you can switch between Xorg and Wayland.