Make the meta click area fit to its visible area

[Rindbee]

Fix #53599.

Previously, items of type ITEM_NEWLINE were ignored, these items had information about their parent item, which might be useful in some cases.

Before	After

[Rindbee]

Click vacuums are now eliminated, these are mostly indents created by indent/ul/ol tags.

Such as the following example. Different colored boxes are used to indicate different types of invisible areas.

1. Blue is for ITEM_NEWLINE.
2. Red is for ITEM_INDENT.
3. Yellow is for ITEM_LIST.
4. Green is for margin.

test text

[p dir=rtl]begin[/p]
rdy
test[color=red]red[/color]
sfsdf
[indent]test
test[url]sdfsdf[/url]
tesst
[ol]
t[url]est[/url]
sfg
gs
test
[ol]
tests[color=red]red[/color]
[indent]tasest
[indent]testfd
test
[ol]test[color=green]green[/color]test[/ol]test
[/indent][/indent]s
[/ol]
[/ol]
[/indent]
test

LTR	RTL

I haven't figured out what they are used for yet, maybe they can be used for quick selection/de-selection. However, the red, yellow and blue click area will not be a vacuum. You can click on these areas for related information.

[akien-mga]

Thanks!