CORE-15901
This fixes display reset transition when an external module acquired
INBV ownership and then released it, similarly to what was done in
commit 0ad65796 for VIDEOPRT.
For this a backup screenbuffer is used to store the contents of the
screen just before an INBV screen acquire transition, and these contents
are restored when it is detected that INBV ownership has been released.
Also, the active text font associated with the active console code-page
is restored, as well as the cursor state and shape.
In addition, any user of BLUE.SYS is now required to explicitly issue
a new IOCTL_CONSOLE_RESET_SCREEN to either enable or disable the screen.
This allows avoiding nasty unwanted screen mode switches when a handle
to the \Device\BlueScreen device is opened but no screen mode switch was
actually wanted - This "fixes" this annoyance on ReactOS and Windows,
when these are running witha VGA-compatible video driver and one wants
to look at properties of the \Device\BlueScreen device using
Sysinternals' WinObj.
Following this, we don't need to check anymore for explicit INBV
ownership by issuing calls to InbvCheckDisplayOwnership(), but instead
we check whether the screen has beeen manually enabled using the
aforementioned IOCTL. This partly supersedes commit 8b553a4b, and allows
fixing the second bug, namely that if we start ReactOS without the
/NOGUIBOOT option (and thus, INBV is active during boot), USETUP would
not show up anything because BLUE.SYS wouldn't display anything on screen.
See CORE-15901.
[USETUP][CONSRV] Call IOCTL_CONSOLE_RESET_SCREEN to tell BlueScreen device to enable the screen.
- Apart from allowing a UI cache variable that may be used when
displaying GENERIC_LIST_ENTRY-ies, do not store any display strings
associated to these list entries. They should be instead computed only
when initializing a list UI (or a combo-box or list control if the
code is used in Win32 environment).
For this matter a callback is provided to InitGenericListUi() that
does the job of computing the displayed string corresponding to a
given GENERIC_LIST_ENTRY.
- Simplify the calls to InitGenericListUi(), and refactor the
RestoreGenericListUiState() function.
- Use for-loops for iterating over GENERIC_LIST items.
- Adapt the storage data format for lists of settings items.
- The txtsetup.sif INF format specified in LoadSetupInf() should not be
INF_STYLE_WIN4 (to be investigated...).
