Description of problem: The text editor has no option to disable spellchecking. How reproducible: Open a text file into the editor, notice the display of the text being made messy by what appears to be spell checking and try to disable spell checking. Expected results: Spell checking MUST NOT be a default for a text editor. There's nothing wrong with a text editor that has spell checking, only it MUST be optional. Otherwise it's not a text editor but some kind of word processing software like libreoffice writer. If wanted something like that, I'd just open all the text files with libreoffice.
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On Fedora 38, GNOME Text Editor 44.0 does have an option to disable spell checking by right-clicking inside the document and then clicking on the “Check Spelling” item in the dropdown. However, the spell checking cannot seem to be disabled by default. It is always enabled in newly opened tabs/windows.
I just explored this issue with gnome-text-editor 44.0 on Fedora 38. The document properties menu (with the icon of a document overlayed with a wrench) contains a menu item called "Check Spelling". When disabled, that menu item seems to set the GSetting value `org.gnome.TextEditor.spellcheck` to `false`. It persists when opening new files, restarting the program, etc. I believe this is the behavior requested already by this bug. Please confirm whether or not this functionality is what you expect, and reopen this bug if it is not.