I have a QPlainTextEdit widget configured with

setLineWrapMode(QPlainTextEdit.WidgetWidth)  # allows QTextBlock inside the QPlainTextEdit to be splitted into multiple lines

which is composed of multiple QTextBlock

Then based on the length of the block and the widget size, the block will be splitted into multiple lines.
I can recover the number of lines inside a block with method

lineCount()

Question:
Is it possible to get a signal or build a signal allowing to trigger a method each time the number of lines inside a block of the QPlainTextEdit widget change ?

My goal:
On the left of my QPlainTextEdit, I have line numbers and I would like to adapt their size (height) so that the line number corresponding to a block match the size of the block (= line height * number of lines inside the block).
To achieve that, I need to trigger this computation each time the height of the block change (when its number of lines change)

Thanks