Flickering/jerking of headers smaller or equal to h3

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What Happened?

When clicking with a mouse to change cursor position in a block that has a parent with h3, h4, h5, h6 tag, there is a very noticable jerk -- the size of that header changes for a split second

Reproduce the Bug

text from the video that contains h4 header

- #### chapter 1 intro  
	- innodb  
		- datafiles in tablesplace  
		- uses mvcc  
			- defaults to REPEATABLE READ  
			- next-key locking strategy prevents phantom reads  
			- locks gaps in the index => prevents phantoms from being inserted  
		- clustered index  
		- strive for a small primary key if you'll have many indexes  
		- optimizations  
			- prefetching from disk  
			- adaptive hash index  

Expected Behavior

There should be no jerking. It is smooth when using h1, h2 or no header tag at all. But not when using h2, h3...

Screenshots

Demo

Desktop or Mobile Platform Information

No response

Additional Context

Desktop 0.8.16

Are you willing to submit a PR?

• I'm willing to submit a PR (Thank you!)

Reproduce the flicker in the editor using the provided nested list with an h4 header, then trace the frontend markdown/header rendering and cursor-position handling. Compare behavior with h1, h2, and no header; done means clicking to reposition the cursor no longer changes h3–h6 header size or causes a visible jerk.