textview: cursor in wrong position after delete lines of text

Question

when N lines of text are deleted the cursor should move up N lines. In the example below deleting lines 3,4 will

line 1 line 2 line 3 line 4 line 5 line 6 line 7

line 1 line 2 line 5 <- cursor SHOULD BE here after delete line 6 line 7

line 1 line 2 line 5 line 6 line 7 <- cursor IS here after delete

该提问来源于开源项目：goki/gi

Answer 1

I can take a look at this.