There is a problem: the cursor changes from a flashing vertical bar to a flashing bottom bar when coding the code. It is found that when the cursor changes to the bottom horizontal bar mode, when the cursor is in the middle of a character, the original character will be replaced when the character is written. The character covered by the cursor.
Problem description: This is because the cursor of the cursor when entering text has two modes: one is the insert mode (the cursor is a vertical bar), and the other is the overlay mode (the cursor is a horizontal bar)
Workaround: Press the Insert key to switch