ChrisS85/AutoHotkey_L — comment on commit 8a9ade4fb72dedf74218898431e889d94d89ba1e
File:  line 0
By Lexikos:

When checking for an empty string, the fastest way is to check just the first character. If it is a null character (zero), the string is empty; otherwise the string is not empty. Also, I presume you meant to check szUrl rather than szID.

if (*item.szUrl) // URL is not empty.

What should happen if the URL cannot be executed? Currently I think nothing happens. Perhaps the g-label should be called so that fallback code can be written. For instance,

if (!*item.szUrl ||
!g_script.ActionExec((LPTSTR)CStringTCharFromWCharIfNeeded(item.szUrl).GetString(), NULL, NULL, false))
pgui->Event(control_index, nmhdr.code, GUI_EVENT_NORMAL, item.iLink + 1);

Checking `control.jump_to_label` is one of the first things GuiType::Event does, so there isn't much need to check it here.