flag.FlagParser bug with certain combination of flags

[larpon]

Describe the bug

There's a bug somewhere in flag.FlagParser that looks like it eats h characters from other input flags/arguments.

Reproduction Steps

v run bug.v:

bug.v:

module main

import flag

pub struct Options {
pub:
	verbosity  int
	dump_usage bool
pub mut:
	additional_args []string
	archs           []string
	v_flags         []string
	api_level       string
}

fn main() {
	args := ['/my/app', '-v', '3', '-f', '-d sdl_memory_no_gc', '-f', '-d shy_use_wren', '--api',
		'21', '--archs', 'arm64-v8a', '/path/to/input.v']

	mut fp := flag.new_flag_parser(args)
	fp.application('bug')
	fp.version('0.2.0')
	fp.description('bugged')
	fp.arguments_description('not important')

	fp.skip_executable()

	mut opt := Options{
		v_flags:    fp.string_multi('flag', `f`, 'Additional flags for the V compiler')
		archs:      fp.string('archs', 0, 'arm64-v8a,armeabi-v7a,x86,x86_64', 'Comma separated string with any of archs').split(',')
		dump_usage: fp.bool('help', `h`, false, 'Show this help message and exit')
		verbosity:  fp.int_opt('verbosity', `v`, 'Verbosity level 1-3') or { 0 }
		api_level:  fp.string('api', 0, '21', 'Android API level to use (--list-apis)')
	}

	opt.additional_args = fp.finalize() or { panic(err) }

	assert opt.v_flags[0] == '-d sdl_memory_no_gc'
	assert opt.v_flags[1] == '-d shy_use_wren' // looks like the builtin support for `-h` eats the "h" in this flag
	assert opt.dump_usage == false
}

Expected Behavior

No assert failures

Current Behavior

./bug.v:41: FAIL: fn main.main: assert opt.v_flags[1] == '-d shy_use_wren'
   left value: opt.v_flags[1] = -d sy_use_wren
  right value: '-d shy_use_wren' = -d shy_use_wren
V panic: Assertion failed...
v hash: 0a61b4a
/dev/shm/v_1000/bug.01J6VQ1CTXWF36ZDQWPBJYG42P.tmp.c:7505: at _v_panic: Backtrace
/dev/shm/v_1000/bug.01J6VQ1CTXWF36ZDQWPBJYG42P.tmp.c:15316: by main__main
/dev/shm/v_1000/bug.01J6VQ1CTXWF36ZDQWPBJYG42P.tmp.c:15375: by main

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.7 0a61b4a

Environment details (OS name and version, etc.)

Linux, EndeavourOS (Arch-based)

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