Filter out per-pixel mouse movement when not in SGR-Pixels mode (#1549)

* #1457 Initial commit compiles but doesn't yet work

* #1457 Fix cell offsets

* #1457 refactor, ClickPosition

* fix nits

* #1457 filter per-pixel motion when not in SGR-Pixels mode

* Much cleaner match condition for filtering mouse events based on encoding protocol

term/src/terminalstate/mouse.rs

@@ -186,7 +186,18 @@ impl TerminalState {
     }
 
     fn mouse_move(&mut self, event: MouseEvent) -> anyhow::Result<()> {
-        let reportable = self.any_event_mouse || !self.current_mouse_buttons.is_empty();
+        let moved = match (&self.last_mouse_move, self.mouse_encoding) {
+            (None, _) => true,
+            (Some(last), MouseEncoding::SgrPixels) => {
+                last.x != event.x
+                    || last.y != event.y
+                    || last.x_pixel_offset != event.x_pixel_offset
+                    || last.y_pixel_offset != event.y_pixel_offset
+            }
+            (Some(last), _) => last.x != event.x || last.y != event.y,
+        };
+
+        let reportable = (self.any_event_mouse || !self.current_mouse_buttons.is_empty()) && moved;
         // Note: self.mouse_tracking on its own is for clicks, not drags!
         if reportable && (self.button_event_mouse || self.any_event_mouse) {
             match self.last_mouse_move.as_ref() {