Fix OLED timeout on satisfaction75 after migration from QWIIC (#14780)

The custom OLED_OFF mode implemented on satisfaction75 is incompatible
with the OLED_TIMEOUT feature (the OLED_TIMEOUT code assumes that any
key or encoder action should turn the OLED display on, and does not
provide any way to disable that behavior).  To keep the OLED_OFF mode
functioning as before while still having a working OLED idle timeout, a
custom implementation of the OLED idle timeout code is added.

keyboards/cannonkeys/satisfaction75/satisfaction_oled.c

@@ -8,7 +8,7 @@ void draw_clock(void);
 __attribute__((weak)) oled_rotation_t oled_init_user(oled_rotation_t rotation) { return OLED_ROTATION_0; }
 
 __attribute__((weak)) void oled_task_user(void) {
-    if (!is_oled_on()) {
+    if (!oled_task_needs_to_repaint()) {
         return;
     }
     oled_clear();
@@ -27,6 +27,70 @@ __attribute__((weak)) void oled_task_user(void) {
     }
 }
 
+// Request a repaint of the OLED image without resetting the OLED sleep timer.
+// Used for things like clock updates that should not keep the OLED turned on
+// if there is no other activity.
+void oled_request_repaint(void) {
+    if (is_oled_on()) {
+        oled_repaint_requested = true;
+    }
+}
+
+// Request a repaint of the OLED image and reset the OLED sleep timer.
+// Needs to be called after any activity that should keep the OLED turned on.
+void oled_request_wakeup(void) {
+    oled_wakeup_requested = true;
+}
+
+// Check whether oled_task_user() needs to repaint the OLED image.  This
+// function should be called at the start of oled_task_user(); it also handles
+// the OLED sleep timer and the OLED_OFF mode.
+bool oled_task_needs_to_repaint(void) {
+    // In the OLED_OFF mode the OLED is kept turned off; any wakeup requests
+    // are ignored.
+    if ((oled_mode == OLED_OFF) && !clock_set_mode) {
+        oled_wakeup_requested = false;
+        oled_repaint_requested = false;
+        oled_off();
+        return false;
+    }
+
+    // If OLED wakeup was requested, reset the sleep timer and do a repaint.
+    if (oled_wakeup_requested) {
+        oled_wakeup_requested = false;
+        oled_repaint_requested = false;
+        oled_sleep_timer = timer_read32() + CUSTOM_OLED_TIMEOUT;
+        oled_on();
+        return true;
+    }
+
+    // If OLED repaint was requested, just do a repaint without touching the
+    // sleep timer.
+    if (oled_repaint_requested) {
+        oled_repaint_requested = false;
+        return true;
+    }
+
+    // If the OLED is currently off, skip the repaint (which would turn the
+    // OLED on if the image is changed in any way).
+    if (!is_oled_on()) {
+        return false;
+    }
+
+    // If the sleep timer has expired while the OLED was on, turn the OLED off.
+    if (timer_expired32(timer_read32(), oled_sleep_timer)) {
+        oled_off();
+        return false;
+    }
+
+    // Always perform a repaint if the OLED is currently on.  (This can
+    // potentially be optimized to avoid unneeded repaints if all possible
+    // state changes are covered by oled_request_repaint() or
+    // oled_request_wakeup(), but then any missed calls to these functions
+    // would result in displaying a stale image.)
+    return true;
+}
+
 
 static void draw_line_h(uint8_t x, uint8_t y, uint8_t len) {
     for (uint8_t i = 0; i < len; i++) {