In 60dea59815, insertText was modified from the original to work with reply mentioning. This was done due to a misunderstanding of the API: the selection range isn't the selection to replace, but rather the final selection state after replacing the *current* selection with the text. This commit restores the original, correct implementation of insertText and instead adjusts the `insertBetween`method of BasicEditorDriver to set selection state before executing `insertText`.
Fixes https://github.com/flarum/core/issues/2877
2b3691e7cc