comp - disable grab by default due to it causing erratic rendering

so i found something interesting. the grab option causes some erratic
framerate in clients IF thoise clients have to sync to the xserver and
themselves try and render more smoothly. it masically means animators
get delayed due to unusually long render times because of this. this
fixes that. this also adds a comp config version number allowing the
code to upgrade a users config to turn this off and thus allows for
future upgrades too.

src/bin/e_comp.c

@@ -4770,6 +4770,23 @@ e_comp_init(void)
    else
      conf = e_comp_cfdata_config_new();
 
+   // comp config versioning - add this in. over time add epochs etc. if
+   // necessary, but for now a simple version number will do
+   if (conf->version < E_COMP_VERSION)
+     {
+        switch (conf->version)
+          {
+           case 0:
+             // going from version 0 we should disable grab for smoothness
+             conf->grab = 0;
+             /* fallthrough */
+           default:
+             break;
+          }
+        e_config_save_queue();
+        conf->version = E_COMP_VERSION;
+     }
+
    if (!getenv("ECORE_X_NO_XLIB"))
      {
         if (ecore_evas_engine_type_supported_get(ECORE_EVAS_ENGINE_OPENGL_X11))

src/bin/e_comp_cfdata.c

@@ -32,6 +32,7 @@ e_comp_cfdata_edd_init(E_Config_DD **conf_edd, E_Config_DD **match_edd)
 #undef D
 #define T E_Comp_Config
 #define D *conf_edd
+   E_CONFIG_VAL(D, T, version, INT);
    E_CONFIG_VAL(D, T, shadow_style, STR);
    E_CONFIG_VAL(D, T, engine, INT);
    //E_CONFIG_VAL(D, T, max_unmapped_pixels, INT);
@@ -79,6 +80,7 @@ e_comp_cfdata_config_new(void)
    E_Comp_Match *mat;
 
    cfg = E_NEW(E_Comp_Config, 1);
+   cfg->version = E_COMP_VERSION;
    cfg->shadow_style = eina_stringshare_add("default");
    cfg->engine = E_COMP_ENGINE_SW;
    cfg->max_unmapped_pixels = 32 * 1024;  // implement
@@ -92,7 +94,7 @@ e_comp_cfdata_config_new(void)
    cfg->lock_fps = 0;
    cfg->efl_sync = 0;
    cfg->loose_sync = 1;
-   cfg->grab = 1;
+   cfg->grab = 0;
    cfg->vsync = 1;
 #ifdef ECORE_EVAS_GL_X11_OPT_SWAP_MODE
    cfg->swap_mode = ECORE_EVAS_GL_X11_SWAP_MODE_AUTO;

src/bin/e_comp_cfdata.h

@@ -4,8 +4,11 @@ typedef struct _E_Comp_Match  E_Comp_Match;
 #else
 #ifndef E_COMP_CFDATA_H
 #define E_COMP_CFDATA_H
+
+#define E_COMP_VERSION 1
 struct _E_Comp_Config
 {
+   int           version;
    const char   *shadow_style;
    int           engine;
    int           max_unmapped_pixels;