csi: '\E[0 q' resets the cursor style to the default, not '\E[2 q'

Also update 'Se' capability in the terminfo, to reflect this.

CHANGELOG.md

@@ -39,6 +39,10 @@
 * Mouse cursor from `hand2` to `left_ptr` when client is capturing the
   mouse.
 * Sixel images are now removed when the font size is **decreased**.
+* `DECSCUSR` (_Set Cursor Style_, `CSI Ps SP q`) now uses `Ps=0`
+  instead of `Ps=2` to reset the style to the user configured default
+  style. `Ps=2` now always configures a _Steady Block_ cursor.
+* `Se` terminfo capability from `\E[2 q` to `\E[ q`.
 
 
 ### Deprecated

csi.c

@@ -1446,12 +1446,17 @@ csi_dispatch(struct terminal *term, uint8_t final)
         case 'q': {
             int param = vt_param_get(term, 0, 0);
             switch (param) {
-            case 0: case 1: /* blinking block */
-                term->cursor_style = CURSOR_BLOCK;
+            case 0: /* blinking block, but we use it to reset to configured default */
+                term->cursor_style = term->default_cursor_style;
+                if (term->default_cursor_blink)
+                    term_cursor_blink_enable(term);
+                else
+                    term_cursor_blink_disable(term);
                 break;
 
-            case 2:         /* steady block - but can be overriden in footrc */
-                term->cursor_style = term->default_cursor_style;
+            case 1:         /* blinking block */
+            case 2:         /* steady block */
+                term->cursor_style = CURSOR_BLOCK;
                 break;
 
             case 3:         /* blinking underline */
@@ -1469,8 +1474,8 @@ csi_dispatch(struct terminal *term, uint8_t final)
                 break;
             }
 
-            if (param <= 6) {
-                if (param == 0 || param & 1)
+            if (param > 0 && param <= 6) {
+                if (param & 1)
                     term_cursor_blink_enable(term);
                 else
                     term_cursor_blink_disable(term);

foot.info

@@ -30,7 +30,7 @@ foot+base|foot base fragment,
     Cs=\E]12;%p1%s\E\\,
     E3=\E[3J,
     Ms=\E]52;%p1%s;%p2%s\E\\,
-    Se=\E[2 q,
+    Se=\E[ q,
     Ss=\E[%p1%d q,
     Sync=\EP=%p1%ds\E\\,
     acsc=``aaffggiijjkkllmmnnooppqqrrssttuuvvwwxxyyzz{{||}}~~,