Word selecting in code editor could be improved

[TX256]

Double-clicking words/operators in GDscript code editor doesn't work as it does in many other text/code editors.

For example, assume that the | character is where the user double-clicks:

func |foobar():
	print("nope")

func foobar|():
	print("nope")

func foobar(|arg):
	print("nope")

func |_foobar():
	print("nope")

if true =|= false:
	print("nope")

if true !|= false:
	print("nope")

In any of these cases, no words/operators are selected. So, most importantly, when clicking on the start of a word, or end of a word, no selection happens.

Also, double-clicking (at least in the middle of) the == or != operators should select the whole operator.

e.g. in Notepad, Intellij IDEA and VSCode, all of these cases work as one would intuitively assume.

[kitbdev]

• Your first four examples should be fixed by Fix words not being selected by endpoints godot#89556, which was merged recently
• And the other ones should be fixed by Treat punctuation as words and as word separators godot#93870