RFR: 8329340: Remove unused libawt code

[Daniel Jeliński]

On Fri, 29 Mar 2024 21:51:25 GMT, Phil Race <prr at openjdk.org> wrote:

> About the WM_AWT messages, how did these tools you mention figure out no message of that name / ID is ever created ?
I presume that's what you must have done to decide it is OK to remove the handling of these messages.

Well, that part was actually me. The linker reported that `AwtObject::WinThreadExec` was unused; while removing it, I found that `WM_AWT_EXECUTE_SYNC` is no longer needed, so I removed it as well. Then I figured that there may be other left over WM_AWT messages, so I checked the entire enum in awtmsg.h. I removed every enum constant that was never used outside of the WIN_MSG macro or a case label.

I checked the history for some of the messages; WM_AWT_FORWARD_BYTE was last used before e4f977c0a1663dd71aa19019d55b07d87ad667e2, and the last use of WM_AWT_SHOWCURSOR / WM_AWT_HIDECURSOR was removed in e4c9db984fe1a3a9d06fb60e333e92df3b165454. WM_AWT_SET_SCROLL_INFO was not used anywhere in git history. The other removed enums aren't used anywhere.

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PR Comment: https://git.openjdk.org/jdk/pull/18553#issuecomment-2027971998