text wrap for Blender UI panels (credit to Graswald3d in his G Scatter addon)

bpy_text_wrap.py

import blf
import bpy

def wrap_text(text: str, context):
    return_text = []
    row_text = ''
    
    width = context.region.width
    system = context.preferences.system
    ui_scale = system.ui_scale
    width = (4 / (5 * ui_scale)) * width

    dpi = 72 if system.ui_scale >= 1 else system.dpi
    blf.size(0, 11, dpi)

    for word in text.split():
        word = f' {word}'
        line_len, _ = blf.dimensions(0, row_text + word)

        if line_len <= (width - 16):
            row_text += word
        else:
            return_text.append(row_text)
            row_text = word

    if row_text:
        return_text.append(row_text)

    return return_text


class HelloWorldPanel(bpy.types.Panel):
    """Creates a Panel in the Object properties window"""
    bl_label = "Hello World Panel"
    bl_idname = "OBJECT_PT_hello"
    bl_space_type = 'PROPERTIES'
    bl_region_type = 'WINDOW'
    bl_context = "object"

    def draw(self, context):
        layout = self.layout
        my_text = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.'
        for text in wrap_text(my_text, context):
            layout.label(text=text)


def register():
    bpy.utils.register_class(HelloWorldPanel)


def unregister():
    bpy.utils.unregister_class(HelloWorldPanel)


if __name__ == "__main__":
    register()