When the mouse is outside the editor, the Chinese text cannot be selected accurately

what is this? Ask the passer-by to take a look.
starts with the last word. When the mouse reaches a certain position in the first line, the mouse pulls out the editor area and then continues to select all. At this time, it seems that all of the text is selected, but when using bold or other functions, not all the text is manipulated, only the mouse is selected in the editor, while the mouse is not manipulated in the selection outside the editor

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Mar.21,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3f628-2b7f1.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3f628-2b7f1.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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