Fix #8930: [Win32] Don't handle printable keys on keydown if an edit box is in focus.

Handle printable input only when the matching WM_CHAR message is incoming.
Without an edit box, do the handling in keydown as usual to support hotkeys.

src/video/win32_v.cpp

@@ -552,14 +552,6 @@ LRESULT CALLBACK WndProcGdi(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 			uint scancode = GB(lParam, 16, 8);
 			keycode = scancode == 41 ? (uint)WKC_BACKQUOTE : MapWindowsKey(wParam);
 
-			/* Silently drop all messages handled by WM_CHAR. */
-			MSG msg;
-			if (PeekMessage(&msg, nullptr, 0, 0, PM_NOREMOVE)) {
-				if ((msg.message == WM_CHAR || msg.message == WM_DEADCHAR) && GB(lParam, 16, 8) == GB(msg.lParam, 16, 8)) {
-					return 0;
-				}
-			}
-
 			uint charcode = MapVirtualKey(wParam, MAPVK_VK_TO_CHAR);
 
 			/* No character translation? */
@@ -568,21 +560,26 @@ LRESULT CALLBACK WndProcGdi(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 				return 0;
 			}
 
-			/* Is the console key a dead key? If yes, ignore the first key down event. */
-			if (HasBit(charcode, 31) && !console) {
-				if (scancode == 41) {
-					console = true;
-					return 0;
+			/* If an edit box is in focus, wait for the corresponding WM_CHAR message. */
+			if (!EditBoxInGlobalFocus()) {
+				/* Is the console key a dead key? If yes, ignore the first key down event. */
+				if (HasBit(charcode, 31) && !console) {
+					if (scancode == 41) {
+						console = true;
+						return 0;
+					}
 				}
-			}
-			console = false;
+				console = false;
 
-			/* IMEs and other input methods sometimes send a WM_CHAR without a WM_KEYDOWN,
-			 * clear the keycode so a previous WM_KEYDOWN doesn't become 'stuck'. */
-			uint cur_keycode = keycode;
-			keycode = 0;
+				/* IMEs and other input methods sometimes send a WM_CHAR without a WM_KEYDOWN,
+				 * clear the keycode so a previous WM_KEYDOWN doesn't become 'stuck'. */
+				uint cur_keycode = keycode;
+				keycode = 0;
 
-			return HandleCharMsg(cur_keycode, LOWORD(charcode));
+				return HandleCharMsg(cur_keycode, LOWORD(charcode));
+			}
+
+			return 0;
 		}
 
 		case WM_SYSKEYDOWN: // user presses F10 or Alt, both activating the title-menu