Fix incorrect drag-event threshold when releasing modifiers early

db4313610cab18933c1b1b1348720ea241b9d91e added support for modifier
keys to be released while dragging.

The key release events set wmEvent.prev_type which is used select the
drag threshold, causing the wrong threshold to be used.

Add wmEvent.prev_click_type which is only set when the drag begins.

1 files changed, 9 insertions, 7 deletions

diff --git a/source/blender/windowmanager/WM_types.h b/source/blender/windowmanager/WM_types.h
index cdbaa2739ba..26462402e3d 100644
--- a/source/blender/windowmanager/WM_types.h
+++ b/source/blender/windowmanager/WM_types.h
@@ -636,6 +636,15 @@ typedef struct wmEvent {
   short prev_type;
   /** The previous value of `val`. */
   short prev_val;
+  /**
+   * The previous value of #wmEvent.xy,
+   * Unlike other previous state variables, this is set on any mouse motion.
+   * Use `prev_click` for the value at time of pressing.
+   */
+  int prev_xy[2];
+
+  /** The `type` at the point of the click action. */
+  short prev_click_type;
   /** The time when the key is pressed, see #PIL_check_seconds_timer. */
   double prev_click_time;
   /** The location when the key is pressed (used to enforce drag thresholds). */
@@ -646,13 +655,6 @@ typedef struct wmEvent {
   short prev_click_keymodifier;
 
   /**
-   * The previous value of #wmEvent.xy,
-   * Unlike other previous state variables, this is set on any mouse motion.
-   * Use `prev_click` for the value at time of pressing.
-   */
-  int prev_xy[2];
-
-  /**
    * Modifier states.
    * #KM_SHIFT, #KM_CTRL, #KM_ALT & #KM_OSKEY is apple or windows-key.
    */