[RAPPS] "rapps /INSTALL /S <pkg>": keystrokes typed during the download go to the hidden download dialog, and a space cancels the install

Steps to reproduce

1. Open a Command Prompt.
2. Run rapps /INSTALL /S vlc and press Enter.
3. About 2 seconds later, while RAPPS is still downloading, type echo hello and press Enter.
4. Wait 90 seconds, then run dir "C:\Program Files" /b.

Expected result

VLC installs silently, the same as when nothing is typed. The keystrokes go to the console, which still has the foreground, so it runs echo hello.

Actual result

• The installer is downloaded (vlc-3.0.23-win32.exe is in Documents\RAPPS Downloads) but never run, so VLC is not installed.
• The console never receives the characters up to and including the first space. It reports "Bad command or filename - hello".
• rapps returns errorlevel 0. Nothing tells the user the install was cancelled.

Isolation (same VM, same session)

So the keyboard focus moves to RAPPS's hidden window during a silent install. A space in the typed text cancels the install.

Cause

In base/applications/rapps/loaddlg.cpp, CDownloadManager::Show() creates the silent dialog with CreateDialogParamW and hides it in WM_INITDIALOG. WM_INITDIALOG returns TRUE, so the dialog manager still gives the focus to the first tab stop. In IDD_DOWNLOAD_DIALOG that is the Cancel button. A space reaching it produces BN_CLICKED -> IDCANCEL -> m_bCancelled = TRUE, which skips the install after the current download.

Fix proposed in a PR: return FALSE from WM_INITDIALOG when the dialog is silent. As a separate issue, rapps /INSTALL could also return a non-zero exit code when the install is cancelled.

Screenshots and the debug log excerpt are attached.