Docs: Fixed launching Shell with text over it

Changelog.md

@@ -17,6 +17,7 @@ OpenCore Changelog
 - Added `ApplePanic` to store panic logs on ESP root
 - Fixed `ReconnectOnResChange` reconnecting even without res change
 - Fixed OpenCanopy showing internal icons for external drives
+- Fixed OpenCanopy launching Shell with text over it
 
 #### v0.5.8
 - Fixed invalid CPU object reference in SSDT-PLUG

Include/Library/OcConsoleLib.h

@@ -30,7 +30,8 @@ typedef enum {
 /**
   Special commands sent to Builtin text renderer through TestString.
 **/
-#define OC_CONSOLE_CLEAR_AND_CLIP  L"ClearAndClip"
+#define OC_CONSOLE_CLEAR_AND_CLIP        L"ClearAndClip"
+#define OC_CONSOLE_CLEAR_WHOLE_AND_CLIP  L"ClearWholeAndClip"
 
 /**
   Configure console control protocol with given options.

Library/OcBootManagementLib/OcBootManagementLib.c

@@ -650,6 +650,7 @@ OcRunBootPicker (
         //
         // Clear screen from picker contents before loading the entry.
         //
+        gST->ConOut->TestString (gST->ConOut, OC_CONSOLE_CLEAR_WHOLE_AND_CLIP);
         gST->ConOut->ClearScreen (gST->ConOut);
         //
         // Voice chosen information.

Library/OcConsoleLib/TextOutputBuiltin.c

@@ -570,6 +570,12 @@ AsciiTextTestString (
     This->ClearScreen (This);
     mConsoleMaxPosX = 0;
     mConsoleMaxPosY = 0;
+  } else if (StrCmp (String, OC_CONSOLE_CLEAR_WHOLE_AND_CLIP) == 0) {
+    mConsoleMaxPosX = mGraphicsOutput->Mode->Info->HorizontalResolution / TGT_CHAR_WIDTH;
+    mConsoleMaxPosY = mGraphicsOutput->Mode->Info->VerticalResolution   / TGT_CHAR_HEIGHT;
+    This->ClearScreen (This);
+    mConsoleMaxPosX = 0;
+    mConsoleMaxPosY = 0;
   }
 
   return EFI_SUCCESS;