How to end text-insert undo segment after cursor jump (caused by mouse)?

[David]

Hello

How to end text-insert undo segment after cursor jump (caused by mouse)?

Coming from vim into (evil-mode) spacemacs, I sometimes get frustrated 
that undo segment is not ended when a mouse-caused cursor movement 
occurs. An example : While I am inserting text, touchpad gets often 
touched, causing the cursor to jump elsewhere. If I have entered five 
sentences just where I wanted them, without any jump, but sixth sentence 
gets by mistake entered all over the place because of multiple (three) 
touchpad touches in different places, when I notice this, I need to be 
able to execute (three times) "undo" so that the fives sentences stay 
intact, and the undo operation erase only the sixth sentence from all 
over the place.

Right now when insert gets this way screwed up, the undo tree contains 
only one segment. When I press undo, all six sentences disappear. I have 
to choose all-or-nothing, neither of which is very useful!!

Appending after "blabla" by entering insert mode and typing "This is 
first sentence. " /now mouse click occurs by mistake/ "This is second 
sentence." I get: blabla This is This is second sentence. first 
sentence. Pressing U for undo I need to get : blabla This is first 
sentence. , but I am instead getting: blabla

Interestingly enough, when text is being replaced and not inserted, 
everything works as expected - undo segment ends when mouse moves the 
cursor, so replacing by mistake I can in sequence undo the previous 
changes made after mouse-caused jump.

How can I fix this? Is it a bug, or some funny feature?


Yours sincerely

   David

PS: Please do not advise me to get "disable touch pad while typing" 
working.