Add default limit to OLED dirty processing (#19068)

drivers/oled/oled_driver.h

@@ -170,6 +170,10 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #    define OLED_UPDATE_INTERVAL 50
 #endif
 
+#if !defined(OLED_UPDATE_PROCESS_LIMIT)
+#    define OLED_UPDATE_PROCESS_LIMIT 1
+#endif
+
 typedef struct __attribute__((__packed__)) {
     uint8_t *current_element;
     uint16_t remaining_element_count;

drivers/oled/ssd1306_sh1106.c

@@ -301,7 +301,8 @@ void oled_render(void) {
     oled_on();
 
     uint8_t update_start  = 0;
-    while (oled_dirty) { // render all dirty blocks
+    uint8_t num_processed = 0;
+    while (oled_dirty && num_processed++ < OLED_UPDATE_PROCESS_LIMIT) { // render all dirty blocks (up to the configured limit)
         // Find next dirty block
         while (!(oled_dirty & ((OLED_BLOCK_TYPE)1 << update_start))) {
             ++update_start;