gdk: Clean up GdkModifierType

Remove MOD2..MOD5. Backends are expected to just set
the named modifiers.

docs/reference/gdk/gdk4-sections.txt

@@ -216,7 +216,7 @@ gdk_surface_get_height
 gdk_surface_set_shadow_width
 gdk_surface_get_device_position
 GdkModifierType
-GdkModifierIntent
+GDK_MODIFIER_MASK
 
 <SUBSECTION>
 gdk_surface_get_support_multidevice

gdk/gdktypes.h

@@ -202,57 +202,22 @@ typedef enum
  * @GDK_ALT_MASK: the fourth modifier key (it depends on the modifier
  *  mapping of the X server which key is interpreted as this modifier, but
  *  normally it is the Alt key).
- * @GDK_MOD2_MASK: the fifth modifier key (it depends on the modifier
- *  mapping of the X server which key is interpreted as this modifier).
- * @GDK_MOD3_MASK: the sixth modifier key (it depends on the modifier
- *  mapping of the X server which key is interpreted as this modifier).
- * @GDK_MOD4_MASK: the seventh modifier key (it depends on the modifier
- *  mapping of the X server which key is interpreted as this modifier).
- * @GDK_MOD5_MASK: the eighth modifier key (it depends on the modifier
- *  mapping of the X server which key is interpreted as this modifier).
  * @GDK_BUTTON1_MASK: the first mouse button.
  * @GDK_BUTTON2_MASK: the second mouse button.
  * @GDK_BUTTON3_MASK: the third mouse button.
  * @GDK_BUTTON4_MASK: the fourth mouse button.
  * @GDK_BUTTON5_MASK: the fifth mouse button.
- * @GDK_MODIFIER_RESERVED_13_MASK: A reserved bit flag; do not use in your own code
- * @GDK_MODIFIER_RESERVED_14_MASK: A reserved bit flag; do not use in your own code
- * @GDK_MODIFIER_RESERVED_15_MASK: A reserved bit flag; do not use in your own code
- * @GDK_MODIFIER_RESERVED_16_MASK: A reserved bit flag; do not use in your own code
- * @GDK_MODIFIER_RESERVED_17_MASK: A reserved bit flag; do not use in your own code
- * @GDK_MODIFIER_RESERVED_18_MASK: A reserved bit flag; do not use in your own code
- * @GDK_MODIFIER_RESERVED_19_MASK: A reserved bit flag; do not use in your own code
- * @GDK_MODIFIER_RESERVED_20_MASK: A reserved bit flag; do not use in your own code
- * @GDK_MODIFIER_RESERVED_21_MASK: A reserved bit flag; do not use in your own code
- * @GDK_MODIFIER_RESERVED_22_MASK: A reserved bit flag; do not use in your own code
- * @GDK_MODIFIER_RESERVED_23_MASK: A reserved bit flag; do not use in your own code
- * @GDK_MODIFIER_RESERVED_24_MASK: A reserved bit flag; do not use in your own code
- * @GDK_MODIFIER_RESERVED_25_MASK: A reserved bit flag; do not use in your own code
  * @GDK_SUPER_MASK: the Super modifier
  * @GDK_HYPER_MASK: the Hyper modifier
  * @GDK_META_MASK: the Meta modifier
- * @GDK_MODIFIER_RESERVED_29_MASK: A reserved bit flag; do not use in your own code
- * @GDK_MODIFIER_RESERVED_30_MASK: A reserved bit flag; do not use in your own code
- * @GDK_MODIFIER_MASK: a mask covering all modifier types.
  *
  * A set of bit-flags to indicate the state of modifier keys and mouse buttons
  * in various event types. Typical modifier keys are Shift, Control, Meta,
  * Super, Hyper, Alt, Compose, Apple, CapsLock or ShiftLock.
  *
- * Like the X Window System, GDK supports 8 modifier keys and 5 mouse buttons.
+ * Note that GDK may add internal values to events which include values outside
- *
+ * of this enumeration. Your code should preserve and ignore them.  You can use
- * GDK recognizes which of the Meta, Super or Hyper keys are mapped
+ * %GDK_MODIFIER_MASK to remove all private values.
- * to Mod2 - Mod5, and indicates this by setting %GDK_SUPER_MASK,
- * %GDK_HYPER_MASK or %GDK_META_MASK in the state field of key events.
- *
- * Note that GDK may add internal values to events which include
- * reserved values such as %GDK_MODIFIER_RESERVED_13_MASK.  Your code
- * should preserve and ignore them.  You can use %GDK_MODIFIER_MASK to
- * remove all reserved values.
- *
- * Also note that the GDK X backend interprets button press events for button
- * 4-7 as scroll events, so %GDK_BUTTON4_MASK and %GDK_BUTTON5_MASK will never
- * be set.
  */
 typedef enum
 {
@@ -260,10 +225,7 @@ typedef enum
   GDK_LOCK_MASK     = 1 << 1,
   GDK_CONTROL_MASK  = 1 << 2,
   GDK_ALT_MASK      = 1 << 3,
-  GDK_MOD2_MASK     = 1 << 4,
+
-  GDK_MOD3_MASK     = 1 << 5,
-  GDK_MOD4_MASK     = 1 << 6,
-  GDK_MOD5_MASK     = 1 << 7,
   GDK_BUTTON1_MASK  = 1 << 8,
   GDK_BUTTON2_MASK  = 1 << 9,
   GDK_BUTTON3_MASK  = 1 << 10,
@@ -273,12 +235,18 @@ typedef enum
   GDK_SUPER_MASK    = 1 << 26,
   GDK_HYPER_MASK    = 1 << 27,
   GDK_META_MASK     = 1 << 28,
-  
-  /* Combination of GDK_SHIFT_MASK..GDK_BUTTON5_MASK + GDK_SUPER_MASK
-     + GDK_HYPER_MASK + GDK_META_MASK */
-  GDK_MODIFIER_MASK = 0x1c001fff
 } GdkModifierType;
 
+
+/**
+ * GDK_MODIFIER_MASK:
+ *
+ * A mask covering all entries in #GdkModifierType.
+ */
+#define GDK_MODIFIER_MASK (GDK_SHIFT_MASK|GDK_LOCK_MASK|GDK_CONTROL_MASK| \
+                           GDK_ALT_MASK|GDK_SUPER_MASK|GDK_HYPER_MASK|GDK_META_MASK| \
+                           GDK_BUTTON1_MASK|GDK_BUTTON2_MASK|GDK_BUTTON3_MASK| \
+                           GDK_BUTTON4_MASK|GDK_BUTTON5_MASK)
 /**
  * GdkModifierIntent:
  * @GDK_MODIFIER_INTENT_PRIMARY_ACCELERATOR: the primary modifier used to invoke