Mark all keys as "up" when the refresher is restarted

This is a less intrusive variant of the old Key_ClearState() function.
When the refresher is restarted or the menu is left, this function is
called to mark all keys as "up". That works around some corner cases
where a key is still marked "down" and thus the first stroke is detected
as a repetition.

src/backends/generic/vid.c

@@ -39,6 +39,7 @@
 #include <errno.h>
 
 #include "../../client/header/client.h"
+#include "../../client/header/keyboard.h"
 
 typedef struct vidmode_s
 {
@@ -173,6 +174,9 @@ VID_LoadRefresh(void)
 		return false;
 	}
 
+	/* Ensure that all key states are cleared */
+	Key_MarkAllUp();
+
 	Com_Printf("------------------------------------\n\n");
 	return true;
 }

src/client/cl_keyboard.c

@@ -1088,3 +1088,16 @@ Key_Event(int key, qboolean down, qboolean special)
 	}
 }
 
+/*
+ * Marks all keys as "up"
+ */
+void
+Key_MarkAllUp(void)
+{
+	int key;
+
+	for (key = 0; key < K_LAST; key++)
+	{
+		key_repeats[key] = 0;
+	}
+}

src/client/header/keyboard.h

@@ -292,6 +292,7 @@ void Key_Event(int key, qboolean down, qboolean special);
 void Key_Init(void);
 void Key_WriteBindings(FILE *f);
 void Key_SetBinding(int keynum, char *binding);
+void Key_MarkAllUp(void);
 int Key_GetKey(void);
 
 #endif

src/client/menu/menu.c

@@ -31,6 +31,7 @@
 
 #include <ctype.h>
 #include "../header/client.h"
+#include "../header/keyboard.h"
 #include "header/qmenu.h"
 
 static int m_main_cursor;
@@ -95,6 +96,7 @@ M_ForceMenuOff(void)
     m_keyfunc = NULL;
     cls.key_dest = key_game;
     m_menudepth = 0;
+	Key_MarkAllUp();
     Cvar_Set("paused", "0");
 }